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    Wyświetlanie 1-70 z 70
    Tytuł:
    Mędrzec – ideał człowieka poszukującego mądrości (Syr 14,20 – 15,10). Część I: Działanie mędrca (Syr 14,20-27)
    The Sage – The Model of a Wisdom-Seeker (Sir 14:20–15:10). Part I: The Sage’s Actions (Sir 14:20-27)
    Autorzy:
    Piwowar, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1053653.pdf
    Data publikacji:
    2016-04-25
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II
    Tematy:
    Księga mądrości Syracha
    Syr 14
    20 – 15
    10
    20-27
    mądrość
    poszukiwanie mądrości
    mędrzec
    The Book of Sirach
    Sir 14
    20–15
    wisdom
    seeking wisdom
    sage.
    Opis:
    In Sir 14:20 – 15:10 Sirach continues his teachings concerning the acquisition of wisdom (cf. 1:1-10; 4:16-19 and 6:18-37) (the exegetico-theological analysis conducted in this article is based on the Greek version of the fragment). In the pericope the author presents the sage as a model and an example to follow for all those who wish to acquire wisdom. The pericope under analysis here comprises two parts. The present article focuses on the first one (14:20-27), in which Sirach concentrates on the actions the sage undertakes to acquire wisdom. The second section (15:1-10) in turn makes use of three metaphors to present the actions of wisdom throughout the process of a man’s search for it. The first part of the pericope (14:20-27) can be further divided into three sections. In the first one (14:20-21) Sirach praises the man who seeks wisdom, emphasizing his intellectual engagement (in the form of contemplating or pondering) as the basis for reaching the aim and finding wisdom. The second part (14:22-25) presents the actions aimed at acquiring wisdom with the use of three metaphors: the first is that of hunting (14:22), and the second – that of spying (14:23), even though verses 21:23-24 include a prohibition and a harsh reprimand against peeping or eavesdropping. The third metaphor, the most developed of all three, refers to camping next to wisdom (14:24-25). In the final section of part one (14:26-27) Sirach presents the promises made to those who strive to acquire wisdom, namely protection from danger and living close to wisdom.
    Źródło:
    The Biblical Annals; 2016, 6, 2; 183-225
    2083-2222
    2451-2168
    Pojawia się w:
    The Biblical Annals
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Energy Deposition and Dose Distributions on Collimator under Photon Beam
    Autorzy:
    Demir, N.
    Kuluöztürk, Z.
    Akkurt, İ.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402435.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.27.-a
    29.20.Ej
    Opis:
    The bremsstrahlung photon facility where photon beam can be created via bremsstrahlung processes has been installed in many different accelerator in the world. TARLA (Turkish Accelerator and Radiation Laboratory at Ankara) will be first facility of TAC (Turkish Accelerator Center) project in Turkey. An optimal design of collimator is important for obtain a clean high energy photon beam in a bremsstrahlung facility. In this study the photon spectrum has been obtained depending on the entrance angle of the collimator. The energy deposition and dose distributions on the collimator by photon beam generated from 30 MeV energy electron beam have been calculated with FLUKA Monte Carlo simulation code.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-400-B-402
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Statistical Spin Liquid Concept to High-Temperature Superconductivity
    Autorzy:
    Byczuk, K.
    Spałek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930571.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    74.20.Mn
    Opis:
    We apply the concept of statistical spin liquid, in which the doubly occupied quasimomentum configurations {|k⇅⟩} for quasiparticles are excluded from the Fock space, to a planar superconductor with real space pairing. The results compare very well with experimental data for the cuprates, namely (i) the condensed state appears only for the number of holes 0 < δ < 0.15-0.25; (ii) the temperature dependence of the gap is close to the BCS result, but the gap has systematically lower value and is of an extended s-wave form.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 337-340
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Polarons in Two-Dimensional Systems
    Autorzy:
    Morkowski, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011229.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    72.10.Di
    74.20.Mn
    Opis:
    The problem of motion of holes on a square lattice of antiferromagnetically ordered spins is considered. An overview of the theory of hole dynamics in the antiferromagnetic background is presented. Motion of a single hole is rather well understood both by numerical and analytical methods. For small but finite concentration of holes a treatment analogous to the standard polaron theory is discussed starting with an exact mapping of the t-J Hamiltonian into holon and pseudospin variables.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 101-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unconventional Superconducting States of an Almost Localized Fermionic Liquid with Nonstandard Quasiparticles: Generalized Gutzwiller Approach
    Autorzy:
    Kaczmarczyk, J.
    Jędrak, J.
    Spałek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536614.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    71.27.+a
    71.10.Ca
    Opis:
    We apply the concept of generalized (almost localized) Fermi liquid and associated with it unconventional superconductivity with Cooper pairs composed of quasiparticles with the spin dependent masses (in an applied field) and with the effective field, both induced by electron correlations. The pairing among quasiparticles takes place either in reciprocal space (Sect. 2) or in real space (Sect. 3) and is induced by the kinetic exchange of either superexchange (in the generic narrow-band situation) or Kondo-type interaction (in the Kondo-lattice limit of the periodic Anderson model). While the main features of this type of Fermi liquid have been introduced earlier, we present here a picture which is applicable to both heavy-fermion and high-$T_{c}$ superconductivity within a single narrow-band representation of correlated states. Our approach introduces a set of additional concepts (spin-dependent masses, effective fields induced by electron correlations), for which the Landau concept of the Fermi liquid represents still a workable scheme. In the limit of the Kondo lattice, we present the phase diagram incorporating the Fulde-Ferrell-Larkin-Ovchinnikov phase within the BCS-type of pairing, whereas in that of the t-J model we show that the proper choice of renormalization factors and constraints is crucial for the mean-field description of the superconducting state.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 261-266
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First-Principles Study of Kondo Insulator $SmB_{6}$
    Autorzy:
    Gmitra, M.
    Čenčariková, H.
    Farkašovský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1369765.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.28.+d
    71.20.-b
    71.27.+a
    Opis:
    We applied the Perdew-Burke-Ernzerhof hybrid functional (PBE0) within the density functional theory (DFT) to study electronic properties of the heavy fermion Kondo semiconductor $SmB_{6}$. The calculation of the Hartee-Fock exchange contribution to the exact-exchange within the atomic sphere approximation for bulk $SmB_{6}$ represents a computationally efficient, parameter-free method that provides good qualitative and quantitative agreement with photoemission experiments. Specifically, we found an energy difference of 7 eV between the occupied and unoccupied correlated Sm f states. Furthermore, the spin-orbit coupling yields a splitting of the occupied Sm f states of about 1 eV in agreement with recent angular resolved photoemission spectroscopy. The electronic spectrum in the vicinity of the X point shows a hybridization between the Sm 5d conduction band and the localized Sm 4f states at the Fermi level. This might lead to a transport gap opening.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 298-299
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intriguing Magnetoresistivity of $URh_{0.62}Ru_{0.38}Ge$ in the Non-Fermi Liquid Regime
    Autorzy:
    Miiller, W.
    Tran, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810409.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Hf
    71.20.Lp
    71.27.+a
    Opis:
    Magnetoresistivity of $URh_{0.62}Ru_{0.38}Ge$ solid solution was measured in the temperature range 0.35-300 K and in magnetic fields up to 9 T. For the studied system, which lies on the border of ferromagnetism, we observe positive magnetoresistivity in the non-Fermi liquid regime. The finding is in striking disagreement with scenario predicted for ferromagnetic quantum critical point.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 144-146
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy of Magnetic and Transport Properties οf $UAuSb_2$ Single Crystals
    Autorzy:
    Troć, R.
    Bukowski, Z.
    Stępień-Damm, J.
    Sułkowski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810449.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    71.27.+a
    75.30.Gw
    Opis:
    The uranium-gold diantimonide $UAuSb_2$ belongs to a numerous family of ternary compounds crystallizing in a tetragonal structure of the $HfCuSi_2$-type (space group P4/nmm). In this paper the results of magnetization, electrical resistivity and thermopower measured along the main crystallographic directions are reported. Two magnetic transitions, a ferromagnetic one at $T_C$ =31 K and probably an antiferromagnetic one at $T_N$ = 43 K were found. The spontaneous magnetization at 1.9 K amounts about 0.8 $μ_B$ for B ∥ c-axis. Electrical resistivity for j ⊥ c-axis exhibits a $T^2$ exp(-Δ/kT) dependence at low temperatures and a Kondo effect at higher temperatures above $T_N$. The thermopower S for both main crystallographic directions shows a maximum at the temperature close to $T_C$ and the lack of any anomaly at $T_N$.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 181-184
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theory of Unconventional Superconductivity in Strongly Correlated Systems: Real Space Pairing and Statistically Consistent Mean-Field Theory - in Perspective
    Autorzy:
    Spałek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431227.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    74.70.Tx
    74.20.-z
    Opis:
    In this brief overview we discuss the principal features of real space pairing as expressed via corresponding low-energy (t-J or periodic Anderson-Kondo) effective Hamiltonian, as well as consider concrete properties of those unconventional superconductors. We also rise the basic question of statistical consistency within the so-called renormalized mean-field theory. In particular, we provide the phase diagrams encompassing the stable magnetic and superconducting states. We interpret real space pairing as correlated motion of fermion pair coupled by short-range exchange interaction of magnitude J comparable to the particle renormalized band energy ≈ tx, where x is the carrier number per site. We also discuss briefly the difference between the real-space and the paramagnon-mediated sources of superconductivity. The paper concentrates both on recent novel results obtained in our research group, as well as puts the theoretical concepts in a conceptual as well as historical perspective. No slave-bosons are required to formulate the present approach.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 764-784
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Accelerated Particle Beam in Isochronous Cyclotron
    Autorzy:
    Voronin, A.
    Partyka, J.
    Aldibekova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1381861.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.27.Bd
    29.20.dg
    41.85.-p
    Opis:
    In the paper there are given calculated and experimental data which allow to form necessary beam parameters for a precise experiment in nuclear physics. An intensity of a beam extracted from an isochronous cyclotron acceleration chamber ($E_{p}$ = 30 MeV) can reach 15 μA with an energy spread of 3 × $10^{-3}$. Accelerated ion beams of such kind are widely applicable in nuclear physical experiments.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1408-1411
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pairing Scenarios for the Hubbard Model in the Strong Coupling Limit
    Autorzy:
    Apinyan, V.
    Kopeć, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812294.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    71.10.Fd
    74.20.Rp
    Opis:
    We consider a spin-rotationally invariant Hubbard model. The original electron operator is presented in the charge-spin-fermion U(1)×SU(2) factorized form. The factorization procedure is given in terms of the emergent gauge fields. As a result, the electron appears like a composite object consisting of strongly fluctuating phase field and spatially rotating spin axis. Furthermore, we elaborate microscopically on the form of possible pairing states.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 159-163
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Capacity of Heavy Fermion Compound $CeCu_4Ga$ in High Magnetic Fields
    Autorzy:
    Kowalczyk, A.
    Toliński, T.
    Reiffers, M.
    Zapotoková, M.
    Falkowski, M.
    Gažo, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810399.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.Ba
    71.20.Eh
    71.27.+a
    Opis:
    The heat capacity in the applied magnetic field up to 9 T, susceptibility and magnetization of polycrystalline $CeCu_{4}Ga$ are presented. Magnetic ordering was not observed down to 2 K. For temperature T < 200 K a Curie-Weiss behavior is observable giving an effective magnetic moment $μ_\text{eff}$ =2.53 $μ_{B}$/f.u. The experimental value of $μ_\text{eff}$ is close to the calculated one for a free $Ce^{3+}$ ion ($μ_\text{eff}$ = 2.54 $μ_{B}$/f.u.), thus indicating the presence of well localized magnetic moments carried by the stable $Ce^{3+}$ ions. At low temperatures the electronic heat capacity coefficient value depends strongly on the temperature range used for the extrapolation and applied magnetic field. We observe a typical heavy fermion behavior with γ value of about 380 mJ $\text{mol}^{-1} K^{-2}$ obtained from extrapolation to T = 0 K of the temperature range above 7 K. However, extrapolation of the lowest temperatures range yields the γ value of 3.3 J $\text{mol}^{-1} K^{-2}$.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 123-125
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity in Hubbard Model with Correlated Hopping
    Autorzy:
    Bułka, B. R.
    Robaszewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955520.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    71.30.+h
    74.20.Mn
    Opis:
    Using the slave-boson method in its spin- and charge-rotational invariant representation we determine stability of the superconducting state in the Hubbard model with correlated hopping. In general the term with correlated hopping violates electron-hole symmetry, however, in the special case when the correlated hopping integral X is equal to the uncorrelated hopping integral t the electron-hole symmetry remains. We investigate this case and show that correlations induced by onsite Coulomb interactions U yield to the normal state with exactly single occupied sites (corresponding to |U=∞⟩). The phase diagram of the superconducting state is determined for the different electron concentration n. At the half-filled band (n=1) a direct transition from the Mott insulator to the superconducting state occurs.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 363-366
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Relativistic Warm Plasma Waveguide and High Frequency Electrical Field on Beam-Plasma Interaction
    Autorzy:
    El-Shorbagy, Kh. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047358.pdf
    Data publikacji:
    2007-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.27.Ny
    52.35.-g
    94.20.wf
    Opis:
    The paper is concerned with investigation of the influence of an intense high frequency electric field and relativistic warm plasma waveguide on electrostatic oscillations of nonuniform bounded plasma. The stabilizing effect of a strong high frequency (pump) electrical field on beam-plasma interaction in a cylindrical relativistic warm plasma waveguide is discussed. A new mathematical technique "separation method" was applied to the two-fluid plasma model to separate the equations, which describe the system, into two parts, time and space parts. Plasma electrons are considered to have a relativistic, thermal velocity. It is shown that a high frequency electric field has no essential influence on dispersion characteristics of unstable surface waves excited in a relativistic warm plasma waveguide by a low-density electron beam. The region of instability is only slightly narrowing and the growth rate decreases by a small parameter and this result was reduced comparing to cold, nonrelativistic plasma. Also, it is found that the plasma electrons did not affect the solution of the space part of the problem.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 1; 41-48
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Polarons in Antiferromagnetic Planes
    Autorzy:
    Morkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047298.pdf
    Data publikacji:
    2007-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    72.10.Di
    74.20.Mn
    Opis:
    In the lecture the theory of spin polarons is reviewed on the basis of its analogy with the theory of lattice polarons. The energy dispersion curve for a single polaron in a two-dimensional antiferromagnetic square lattice is calculated in the self-consistent Born approximation. Also in self-consistent Born approximation the energy of a pair of interacting spin polarons is calculated. The results of calculations for realistic values of parameters of the model lead to the conclusion that pairing of spin polarons is not a likely mechanism of superconductivity in cuprates.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 4; 397-408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties and Electronic Structure of CeTIn (T = Ni, Cu, Pd, Au) Compounds
    Autorzy:
    Szytuła, A.
    Penc, B.
    Gondek, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047306.pdf
    Data publikacji:
    2007-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    71.27.+a
    75.20.Hr
    79.60.-i
    Opis:
    The electronic structure of the ternary CeTIn (T = Ni, Cu, Pd, Au) compounds was investigated by means of X-ray photoelectron spectroscopy. Our interest was aimed mainly to the valence bands and the Ce3d core levels of investigated compounds. Analysis of the valence bands indicates that they are mainly determined by the Tnd band, whereas a share of the R4f states can be estimated to be about a few percent only. The analysis of the differential valence bands spectra between CeTIn and LaTIn analogues suggests that the Ce4f$\text{}^{1}$ ground states shift deeper below the Fermi level with an increase in the 4f level occupation factor. The analysis of the Ce3d spectra made on the basis of the Gunnarsson-Schönhammer model indicates the hybridization parameter equal to 148 meV for CeNiIn, 45 meV for CeCuIn, 177 meV for CePdIn, and 123 meV for CeAuIn.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 4; 475-486
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure of CePtIn and LaPtIn Compounds
    Autorzy:
    Jezierski, A.
    Penc, B.
    Szytuła, A.
    Winiarski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419892.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    71.27.+a
    79.60.-i
    Opis:
    The electronic structure of the ternary RPtIn (R = La, Ce) compounds, which crystallize in the hexagonal ZrNiAl-type structure, was studied by X-ray photoelectron spectroscopy measurements and calculation using the ab initio methods (linear muffin-tin orbital in the atomic sphere approximation, full potential linear muffin-tin orbital, full potential linear orbital). The results showed that the valence band in these compounds is formed by the Pt 5d and In 5s and 5p states. The band calculations with spin-orbit coupling have shown that the Ce 4f peaks consist of two peaks above the Fermi level that correspond to the $Ce 4 f_{7/2}$ and $4 f_{5/2}$ doublet and wide peaks corresponding to the La 4f states. The analysis of Ce 3d spectra on the basis of the Gunnarsson-Schönhammer model gives hybridization of 4f orbitals with the conduction electron band equal to 170 meV.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 212-215
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metals and Semimetals with Strongly Correlated Electrons
    Autorzy:
    Fulde, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953157.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Hr
    71.27.+a
    71.10.Fd
    75.30.Mb
    Opis:
    A characteristic feature of strongly correlated electrons is the appearance of low energy scales. They may result in heavy-quasiparticle excitations at low temperatures. Our understanding of these excitations has been considerably modified over the last few years. While it was originally thought that the Kondo effect is the sole source of heavy-fermion behavior, two additional mechanisms have been identified meanwhile. One is based on the Zeeman effect and occurs in Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4}$. The other is operative in the semimetal Yb$\text{}_{4}$As$\text{}_{3}$ and is based on nearly half filled one-dimensional Hubbard chains. In all three cases the low energy excitations result from spin degrees of freedom.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 67-76
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crossover from BCS to Bose-Einstein in Hubbard Model
    Autorzy:
    Pedersen, M. H.
    Schneider, T.
    Beck, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955835.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    71.10.Fd
    74.20.-z
    71.10.-w
    Opis:
    We generalize the standard attractive Hubbard, having an on-site pair creation operator Q$\text{}_{i}$ = a$\text{}_{i↑}$a$\text{}_{i↓}$, to one with n components Q$\text{}_{iα}$ = a$\text{}_{iα↑}$a$\text{}_{iα↓}$, α=1,2,...,n. In the limit n → ∞ we obtain the Ginzburg-Landau functional. On this basis we explore the crossover from weak (BCS) to strong coupling (Bose-Einstein condensation) superconductivity. The associated self-consistent equations for the Ginzburg-Landau parameters are similar to those of the T-matrix approach. The evolution of the band structure with increasing interaction strength is studied and correlated with the behavior of the pair propagator and the transition temperature. We find that the pairing interaction creates a new band which moves downwards in energy as the interaction strength increases and separates into a lower Hubbard band when the interaction strength becomes comparable to the band width. In the strong coupling regime, a third band with small spectral weight is also found in between the lower and upper Hubbard bands.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 419-422
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the BCS-BEC Crossover in the 2D Asymmetric Attractive Hubbard Model
    Autorzy:
    Kujawa-Cichy, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426931.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Rp
    71.27.+a
    71.10.Hf
    Opis:
    We analyze the evolution from the weak coupling (BCS-like limit) to the strong coupling limit of tightly bound local pairs in the 2D asymmetric attractive Hubbard model, in the presence of the Zeeman magnetic field (h). The broken symmetry Hartree approximation is used. We also apply the Kosterlitz-Thouless scenario to determine the phase coherence temperatures. We obtain that for the spin dependent hopping integrals $(t^{↑} ≠ t^{↓})$ the homogeneous polarized superfluid $(SC_{M})$ phase in the ground state for the strong attraction and lower filling can be stabilized. We find a topological quantum phase transition (the Lifshitz type) from the unpolarized superfluid phase $(SC_0)$ to $SC_{M}$ and tricritical point in the (h - μ) and spin polarization (P) vs. attraction (U < 0) ground state phase diagrams. The finite temperatures phase diagrams for $t^{↑} ≠ t^{↓}$ are constructed.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1066-1069
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lanthanide Contraction in $RENi_5$ (RE~=~La, Ce, Nd, Sm, Eu, Gd, Tb,~Yb) Compounds Studied with Band Structure Calculations
    Autorzy:
    Goraus, J.
    Maślankiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426989.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.20.Lp
    71.27.+a
    31.15.E-
    Opis:
    Full potential linearized augmented plane wave band structure calculations were performed for hexagonal $RENi_5$ (RE = rare earth) compounds in order to investigate reproducibility of lanthanide contraction by ab initio studies. The a and c parameters were optimised using a paraboloid fit, starting from the same initial values for all compounds studied. The trend in lattice parameters across the RE series obtained from the calculations was found to be in general agreement with experimental data. A comparison of results obtained by generalized gradient approximation and generalized gradient approximation with additional Coulomb correlations calculations is presented for several double counting schemes.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1076-1078
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strongly Correlated Electron Behaviour in $CeT_2Al_8$ (T~=~Fe,~Co)
    Autorzy:
    Ghosh, S.
    Strydom, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427072.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    71.27.+a
    75.30.Mb
    75.20.Hr
    Opis:
    We report on studies of physical properties of the two compounds $CeFe_2Al_8$ and $CeCo_2Al_8$ in which we have found varying degrees of electronic correlational phenomena. No magnetic ordering was detected down to 0.4 K in either of the two compounds. At elevated temperatures an incoherent Kondo interaction between the Ce 4f-electron and the conduction electrons is prevalent in both compounds. $CeCo_2Al_8$ exhibits a stable 4f-electron magnetic moment, but in $CeFe_2Al_8$ an intermediate-valent state prevails near room temperature that eventually transforms into a Fermi-liquid ground state. The low-temperature specific heat of $CeCo_2Al_8$ shows typical strongly correlated electron behaviour and a - logT upturn in its electronic specific heat below about 10 K.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1082-1084
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Imbalanced d-Wave Superfluids Within the Spin Polarized Extended Hubbard Model: Weak Coupling Limit
    Autorzy:
    Kujawa-Cichy, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431324.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Rp
    71.27.+a
    71.10.Hf
    Opis:
    We investigate the superfluid properties of d-wave pairing symmetry within the Extended Hubbard Model (EHM) in a magnetic field. We analyze the temperature and magnetic field dependencies of the order parameter. We find that in the two-dimensional case, the spatially homogeneous spin polarized superfluidity (SC(P≠0)) is stable in the weak coupling limit, at T=0, as opposed to the s-wave pairing symmetry case in 2D. We construct the ground state phase diagrams both for fixed chemical potential and electron concentration. Furthermore, we obtain the temperature vs. magnetic field and temperature vs. spin polarization phase diagrams.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 824-827
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of the Bound States on a Hexagonal Lattice
    Autorzy:
    Bak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047341.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Rp
    71.27.+a
    71.10.Hf
    Opis:
    Two electrons on a lattice pose an interesting problem which can be solved exactly. When the effective interactions are strong enough, the bound states are formed. The properties of such bound pairs in an extended Hubbard model are examined for both signs of nearest neighbor hopping integral t. The stabilization of s*-wave pairing is found for t<0 and of f-wave for t>0. Phase diagrams for the existence of none, one or two s*-wave solutions are calculated.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 781-789
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anderson-Kondo Lattice Hamiltonian from the Anderson-Lattice Model: A Modified Schrieffer-Wolff Transformation and the Effective Exchange Interactions
    Autorzy:
    Kądzielawa-Major, E.
    Spałek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374041.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    71.20.Eh
    71.27.+a
    71.70.Gm
    Opis:
    We derive the Anderson-Kondo lattice model by applying canonical perturbation expansion for the Anderson-lattice model in direct space. The transformation is carried out up to the fourth order by a modified Schrieffer-Wolff transformation: we separate the part of hybridization term responsible for the high-energy processes (involving the largest in-the-system intraatomic Coulomb interaction between f electrons) and replace it with the virtual processes in higher orders. The higher-order processes lead to three separate exchange interactions. The obtained Hamiltonian contains both the Kondo (f-c) and the superexchange (f-f) interactions, as well as a residual hybridization responsible for the heavy-quasiparticle formation. This effective Hamiltonian can be used to analyze the magnetic or the paired states, as well their coexistence in heavy-fermion systems. The magnitudes of both the Kondo exchange and the superexchange integrals are estimated as a function of bare hybridization magnitude.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-100-A-103
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed State in t-U-J-V Model
    Autorzy:
    Tobijaszewska, B.
    Bak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810406.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    74.20.Rp
    74.25.Dw
    71.10.Fd
    71.27.+a
    Opis:
    The t-U-J-V model in the U → ∞ limit is treated by renormalized mean-field theory for arbitrary electron density. Superconductivity of s+id symmetry is found in the large parts of the phase diagram. Calculations also show a possibility of phase separation.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 135-137
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the BCS-BEC Crossover in the Spin-Polarized Attractive Hubbard Model at T=0
    Autorzy:
    Kujawa-Cichy, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537284.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Rp
    71.27.+a
    71.10.Hf
    Opis:
    The influence of the Zeeman magnetic field (h) on the ground state evolution of superfluid properties from the weak coupling (BCS-like) to the strong coupling limit of tightly bound local pairs with increasing attraction has been studied. The analysis was carried out within the spin-polarized attractive Hubbard model, for a fixed number of particles and a d = 3 simple cubic lattice. The broken symmetry Hartree approximation was used. For strong attraction and in the dilute limit, the homogeneous magnetized superconducting phase $(SC_{M})$ was found in the h-|U| and P-|U| diagrams.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 423-425
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Valence Band of $Ce_2Co_{0.8}Si_{3.2}$ and $Ce_2RhSi_3$ Studied by Resonant Photoemission Spectroscopy and FPLO Calculations
    Autorzy:
    Starowicz, P.
    Kurleto, R.
    Goraus, J.
    Walczak, Ł.
    Penc, B.
    Adell, J.
    Szlawska, M.
    Kaczorowski, D.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374249.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.Mb
    71.20.Eh
    74.25.Jb
    Opis:
    This work presents studies of the valence band of two Kondo lattice systems: $Ce_2Co_{0.8}Si_{3.2}$, which is paramagnetic with the Kondo temperature $T_{K}$ ≈50 K and $Ce_2RhSi_3$, which is antiferromagnetic below $T_{N}$=4.5 K and exhibits $T_{K}$ ≈9 K. The photoemission spectra, which are obtained with photon energy tuned to Ce 4d-4f resonance, reveal a Kondo peak at the Fermi energy $(E_{F})$, its spin-orbit splitting partner at 0.24 eV and a broad maximum related to Ce $f^0$ final state. The spectra indicate that Kondo peak has a higher intensity for $Ce_2Co_{0.8}Si_{3.2}$. The off-resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards $E_{F}$ for $Ce_2Co_{0.8}Si_{3.2}$ as compared to $Ce_2RhSi_3$. Full-potential local-orbital calculations were realized with local spin density approach +U approach for 213 stoichiometry. They show that a higher density of states near $E_{F}$ is observed for $Ce_2CoSi_3$. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of $Ce_2RhSi_3$ and $Ce_2CoSi_3$, respectively.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-144-A-147
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Phase Diagram of Spin-Polarized Attractive Hubbard Model: Weak Coupling Limit
    Autorzy:
    Kujawa, A.
    Micnas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812269.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Rp
    71.27.+a
    71.10.Hf
    Opis:
    The superfluid properties of the attractive Hubbard model in a Zeeman magnetic field, and in the weak coupling regime were investigated. The temperature and magnetic field dependences of the order parameter were analyzed. Furthermore, the temperature vs. magnetic field and temperature vs. spin polarization phase diagrams for the 2D and 3D lattices were obtained. For some parameters a reentrant transition was found.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 43-50
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kondo Lattice and Magnetic Properties in Strongly Correlated Electron Systems
    Autorzy:
    Coqblin, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810279.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    72.15.Qm
    75.10.Nr
    75.20.Hr
    Opis:
    We review here the magnetic properties of some strongly correlated electron systems and especially cerium and uranium compounds. The normal Kondo lattice model with a localized S=1/2 spin can account for the Kondo-magnetism competition observed in cerium or ytterbium systems, while the underscreened Kondo lattice model with a localized S=1 spin can well account for the ferromagnetism - Kondo coexistence observed in some uranium compounds such as UTe. Then, we discuss the spin glass-Kondo competition and present the resulting phase diagrams showing spin glass, Kondo and magnetically ordered phases observed in disordered heavy fermion cerium alloys such as $CeNi_xCu_{1-x}$ alloys.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 13-17
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Properties of the Spin-Polarized Attractive Hubbard Model
    Autorzy:
    Kujawa, A.
    Micnas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810407.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Rp
    71.27.+a
    71.10.Hf
    Opis:
    The influence of a Zeeman magnetic field on the superconducting characteristics of the attractive Hubbard model was investigated. The ground state and temperature phase diagrams were obtained for a fixed number of particles. Two critical magnetic fields were found for the first order phase transition from the superconducting to the normal state for n ≠ 1. For some range of parameters a reentrant transition was found and gapless superconductivity was obtained. The significance of the Hartree term was also analyzed.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 138-140
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The BCS-BEC Crossover and Superconductivity in a Lattice Fermion Model with Hard Core Repulsion
    Autorzy:
    Kujawa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047337.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    74.20.Rp
    71.27.+a
    71.10.Hf
    Opis:
    We considered the BCS-BEC crossover at T=0 in the framework of a lattice fermion model (the extended Hubbard model). We analyzed the case of on-site hard core repulsion (U=∞) and intersite attraction (W<0) in a 3D system with extended s-wave pairing symmetry. The mechanisms of density-driven and attraction-strength-driven crossover were analyzed. We obtained the ground state phase diagram. The analyzed quantities are: chemical potential, order parameter, coherence length, and fraction of condensed particles.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 745-752
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Critical Values for Electron Pairing in t-U-J-V and t-J-V Models
    Autorzy:
    Bak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812342.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    74.20.Fg
    74.20.Rp
    74.25.Dw
    71.10.Fd
    71.27.+a
    Opis:
    The critical values for pairing of s*- and d-wave symmetry are calculated within the t-U-J-V and the t-J-V models in renormalized mean field theory. It is shown that the first model yields the proper critical values in the low density limit while the other does not. Renormalized mean field theory strongly decreases the absolute value of (negative) critical values for larger electron densities.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 275-279
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of coherent synchrotron radiation in bunch compressor of TARLA
    Autorzy:
    Yildiz, H.
    Aksoy, A.
    Arikan, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070217.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.27.Bd
    29.27.-a
    29.20.Ej
    41.60.-m
    41.60.Cr
    41.85.Ja
    41.85.-p
    07.55.Db
    02.10.Yn
    Opis:
    High order and non-linear effects in accelerator beamline play an important role in the transport of the beam. These effects cause variation of designed beam parameters such as emittance growth, bunch length variation, beam halo formation, etc. One of the known non-linear effects in bunch compressors is the coherent synchrotron radiation effect. In this study we focus on coherent synchrotron radiation effect in Turkish Accelerator and Radiation Laboratory in Ankara (TARLA) machine which is designed to drive Infrared Free Electron Laser, covering the range of 3-250 μm. We additionally discuss high order effects in bunch compressor of TARLA.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 214-216
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Calculations for Photon Attenuation Studies on Different Solid Phantom Materials
    Autorzy:
    Gundogdu, O.
    Tarim, U.
    Gurler, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031097.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    21.60.Ka
    25.20.Dc
    87.66.Xa
    25.60.Dz
    29.27.Eg
    Opis:
    The linear attenuation coefficients of water and some solid phantom materials, namely of solid water RMI-457, of plastic water, of RW3 solid water, and of Perspex were determined by Monte Carlo calculations, for gamma-ray photons with energies of 59.5, 80.9, 140.5, 356.5, 661.6, 1173.2, and 1332.5 keV. The calculated values were compared with the experimental results presented by other researchers and with theoretical values obtained using the XCOM database. Good agreement was observed between the calculations, the experimental, and the theoretical values. The results indicate that the process in Monte Carlo code can be followed to determine the equivalency of other materials at several energies. Three shielding factors such as half-value layer, tenth-value layer, and mean free path were calculated at all considered gamma-ray energies.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1032-1035
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Universal Relations in the Attractive Hubbard Model with Next-Nearest Neighbor Hopping
    Autorzy:
    Bak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046748.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Fy
    71.10.Fd
    74.20.Fg
    71.27.+a
    72.10.-d
    Opis:
    Recently a new universal relation between superfluid densityρ$\text{}_{s}$ andσ$\text{}_{dc}$T$\text{}_{c}$, where σ$\text{}_{dc}$ is direct current conductivity and T$\text{}_{c}$ - superconducting critical temperature, was found by Homes et al. (Nature 430, 539 (2004)). The theoretical derivation of the relation based on BCS theory is correct only qualitatively. In the present paper this relation is calculated theoretically, using Hartree-Fock approximation and second-order perturbation theory. It is found that although correct qualitatively, quantitatively the results are too small. Inclusion of the second neighbor hopping improves the results.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 565-568
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Heavy Fermion and Spin-Glass Behavior to Magnetic Order in $CeT_4M$ Compounds
    Autorzy:
    Toliński, T.
    Kowalczyk, A.
    Falkowski, M.
    Synoradzki, K.
    Chełkowska, G.
    Hoser, A.
    Rols, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426703.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    71.27.+a
    75.30.Mb
    75.30.Cr
    75.50.Lk
    78.70.Nx
    Opis:
    We report on the transitions between the ferromagnetic order, spin-glass behavior, heavy fermion and fluctuating valence state in a series of isostructural compounds $CeT_4M$ (T = Ni, Cu; M = Al, Ga, Mn). The dilution of Ce or the T and M elements allowed us to follow the physical properties evolution employing the measurements of the heat capacity, dc magnetic susceptibility, frequency dependent ac magnetic susceptibility, magnetization relaxation, inelastic neutron scattering and also the X-ray photoemission spectroscopy. It is shown that the Mn rich compounds lean towards the spin glass behavior. For the compounds governed by the close to localization Ce 4f states the effect of the crystal electric field has been studied. It has been shown that the spin glass-like behavior can significantly influence the physics of the $CeT_4M$ compounds.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1014-1018
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Correlations within Fermionic Lattice Models
    Autorzy:
    Matlak, M.
    Grabiec, B.
    Krawiec, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047738.pdf
    Data publikacji:
    2007-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.-w
    71.10.Ca
    71.10.Fd
    71.20.Be
    71.27.+a
    71.28.+d
    73.21.La
    78.67.Bf
    Opis:
    We investigate two-site electronic correlations within generalized Hubbard model, which incorporates the conventional Hubbard model (parameters: t (hopping between nearest neighbours), U (Coulomb repulsion (attraction))) supplemented by the intersite Coulomb interactions (parameters: J$\text{}^{(1)}$ (parallel spins), J$\text{}^{(2)}$ (antiparallel spins)) and the hopping of the intrasite Cooper pairs (parameter: V). As a first step we find the eigenvalues E$\text{}_{α}$ and eigenvectors |E$\text{}_{α}$〉 of the dimer and we represent each partial Hamiltonian E$\text{}_{α}$|E $\text{}_{α}$〉〈 E$\text{}_{α}$| (α=1,2,...,16) in the second quantization with the use of the Hubbard and spin operators. Each dimer energy level possesses its own Hamiltonian describing different two-site interactions which can be active only in the case when the level will be occupied by the electrons. A typical feature is the appearance of two generalized t-J interactions ascribed to two different energy levels which do not vanish even for U=J$\text{}^{(1)}$=J{(2)}=V=0 and their coupling constants are equal to ±t in this case. In the large linebreak U-limit for J$\text{}^{(1)}$=J$\text{}^{(2)}$=V=0 there is only one t-J interaction with coupling constant equal to 4t$\text{}^{2}$/|U| as in the case of a real lattice. The competition between ferromagnetism, antiferromagnetism and superconductivity (intrasite and intersite pairings) is also a typical feature of the model because it persists in the case U=J$\text{}^{(1)}$=J$\text{}^{(2)}$=V=0 and t≢0. The same types of the electronic, competitive interactions are scattered between different energy levels and therefore their thermodynamical activities are dependent on the occupation of these levels. It qualitatively explains the origin of the phase diagram of the model. We consider also a real lattice as a set of interacting dimers to show that the competition between magnetism and superconductivity seems to be universal for fermionic lattice models.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 3; 537-547
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zakon krzyżacki w historii, ideologii i działaniu - symbole dziejowe : praca zbiorowa
    Deutsche Ordern : in Geschichte, Ideologie und Wirkung - historische Symbole.
    Współwytwórcy:
    Gancewski, Jan. Redakcja
    Gębura, Krzysztof (1953- ). Tłumaczenie
    Schmeier, André. Tłumaczenie
    Helms, Simon. Opracowanie
    Data publikacji:
    2010
    Wydawca:
    Olsztyn : Wydział Humanistyczny Uniwersytetu Warmińsko-Mazurskiego [etc.]
    Tematy:
    27-788/-789:94(430)]"11/20":94(438).03
    Krzyżacy
    Zamki krzyżackie
    Bitwa pod Grunwaldem (1410)
    Obchody
    Historia
    Polityka historyczna
    Opis:
    Tyt. równol.: Der Deutsche Ordern : in Geschichte, Ideologie und Wirkung - historische Symbole.
    Dostawca treści:
    Bibliografia CBW
    Książka
    Tytuł:
    Tablice i pomniki upamiętniające Powstanie Warszawskie
    Autorzy:
    Świerczek, Lidia.
    Powiązania:
    Warszawa -- o czym mówią pomniki i kamienie Warszawa, 2000 S. 190-208
    Współwytwórcy:
    Stawarz, Andrzej. Redakcja
    Mórawski, Karol (1935-2023). Redakcja
    Data publikacji:
    2000
    Tematy:
    Sesja Popularnonaukowa nt.: O czym mówią pomniki i kamienie... (04-05.11.1999; Warszawa, woj. mazowieckie)
    Warszawa. Pomnik Powstańca konkurs 1945 r.
    Warszawa. Komitet Budowy Pomnika Bojowników Warszawy 1947 r.
    Słupsk. Pomnik Powstańca Warszawskiego 1946 r.
    Pruszków. Pomnik Walczącej Warszawy 1947 r.
    Ząbkowice Śląskie. Pomnik-Mauzoleum ku Czci Bohaterów Warszawy 1947 r.
    Warszawa. Cmentarz Wojskowy. Pomnik Gloria Victis 1945 r.
    Warszawa. Pomnik Obrońców Warszawy. Cmentarz Służewiecki 1946 r.
    Warszawa. Plac Powstańców Warszawy nadanie imienia 1957 r.
    Warszawa. Pomnik ku Czci Żołnierzy AK Zgrupowania "Kryska", Powstańców z AL i Żołnierzy I Armii Wojska Polskiego oraz Ludności Cywilnej, którzy Walczyli na Czerniakowie do dnia 23 Września 1944 r. 1975 r.
    Pomnik Chwała Saperom (08.05.1975; Warszawa)
    Pomnik Powstańców Warszawy (01.08.1979; Warszawa)
    Warszawa. Pomnik Powstania Warszawskiego projekty
    Społeczny Komitet Budowy Pomnika Powstania Warszawskiego 1944 r. (Warszawa) 1981-1984 r.
    Warszawa. Pomnik Bohaterów Warszawy "Warszawska Nike" 1980 r.
    Warszawa. Pomnik Pilotom RAF Zestrzelonym nad Powstańczą Warszawą podczas Dokonywania Zrzutów 1996 r.
    Warszawa. Pomnik Szpitala Wolskiego 1994 r.
    Pomnik Żołnierzy "Baszty" Zamordowanych przez Niemców po Wyjściu z Kanału 27 IX 1944 r. na ul. Dworkowej (27.09.1984; Warszawa)
    Pomnik Polegli -- Niepokonani (20.09.1973; Cmentarz Powstańców Warszawy, Warszawa)
    Pomnik Mokotów Walczący 1944 (27.09.1985; Park Mokotowski, Warszawa)
    Komitet Budowy Pomnika Armii Krajowej (Warszawa) 1989 r.
    Pomnik Polskiego Państwa Podziemnego i Armii Krajowej (11.06.1999; Warszawa, woj. mazowieckie)
    Powstanie 1944 r. warszawskie pomniki i tablice pamiątkowe materiały konferencyjne
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Warszawska rzeźba pomnikowa
    Autorzy:
    Grzesiuk-Olszewska, Irena (1937?-2021).
    Współwytwórcy:
    Bartoszewicz, Dariusz. Recenzja
    Data publikacji:
    2003
    Wydawca:
    Warszawa : Neriton
    Tematy:
    Królewskie Siły Powietrzne (RAF). Sto Czterdziesty Ósmy (148) Dywizjon Bombowy RAF 1944 r.
    Pomnik Najmłodszym Żołnierzom Powstania Warszawskiego 1944 (2.10. 1999; Warszawa)
    Pomnik Polskiego Państwa Podziemnego i Armii Krajowej (10.06. 1999; Warszawa)
    Pomnik ku Czci Żołnierzy 1. Batalionu Szturmowego "Nałęcz" Armii Krajowej (31.07.1998; Warszawa)
    Pomnik RAF-u (Royal Air Forces) (1997; Warszawa)
    Pomnik "Pamięci Walczących o Wolność i Nieepodległość Rzeczypospolitej w 50. Rocznicę Sierpnia 1944 r." (1994; Warszawa)
    Kotwica Polski Walczącej (8.10.1994; Warszawa)
    Pomnik Błogosławionego Księdza Józefa Stanka SAC (23.09.1994; Warszawa)
    Pomnik "Na Pamiątkę Walk Powstaniowych 1944 r. o Królikarnię i Szkołę na ul. Woronicza. Pułk AK "Baszta" (1994; Warszawa)
    Pomnik Bohaterów Powstania Warszawskiego (1.08.1989; Warszawa)
    Pomnik "Mokotów Walczący 1944" (27.04.1985; Warszawa)
    Pomnik Żołnierzy "Baszty" (27.09.1984; Warszawa)
    Pomnik Małego Powstańca (11.10.1983; Warszawa)
    Pomnik Powstańców Warszawy (upamiętniający walki batalionu "Kiliński") (1.08.1979; Warszawa)
    Pomnik Ofiar Czołgu-Pułapki (1975; Warszawa)
    Pomnik Sapera, zwany również: "Chwała Saperom" (8.05.1975; Warszawa)
    Pomnik "Polegli--Niepokonani 1939-1945" (20.09.1973; Warszawa)
    Pomnik Żołnierzy AK Poległych w Ataku na Dworzec Gdański, zwany Nad Partyzancką Mogiłą (29.09.1957; Warszawa)
    Pomnik Bohaterów Warszawy (Warszawa)
    Opis:
    S. 114, Pomnik Powstańców Czerniakowa i Żołnierzy 1. Armii Wojska Polskiego (31.07.1957; Warszawa).
    S. 115, Pomnik Żołnierzy AK Poległych w Ataku na Dworzec Gdański, zwany Nad Partyzancką Mogiłą (29.09.1957; Warszawa).
    S. 120-124, Pomnik Bohaterów Warszawy, zwany również "Warszawską Nike" lub "Nike" (20.07.1964; Warszawa).
    S. 129-133, Pomnik "Polegli--Niepokonani 1939-1945" (20.09.1973; Warszawa).
    S. 133-134, Pomnik Sapera, zwany również: "Chwała Saperom" (8.05. 1975; Warszawa).
    S. 134-135, Pomnik Ofiar Czołgu-Pułapki (1975; Warszawa).
    S. 141-142, Pomnik Powstańców Warszawy (upamiętniający walki batalionu "Kiliński") (1.08.1979; Warszawa).
    S. 152, Pomnik Małego Powstańca (1.10.1983; Warszawa).
    S. 153-154, Pomnik Żołnierzy "Baszty" (27.09.1984; Warszawa).
    S. 157-158, Pomnik "Mokotów Walczący 1944" (27.04.1985; Warszawa).
    S. 168-173, Pomnik Bohaterów Powstania Warszawskiego (1.08.1989; Warszawa).
    S. 181, Pomnik "Na Pamiątkę Walk Powstaniowych 1944 r. o Królikarnię i Szkołę na ul. Woronicza. Pułk AK "Baszta" (1994; Warszawa).
    S. 184-185, Pomnik Błogosławionego Księdza Józefa Stanka SAC (23.09. 1994; Warszawa).
    S. 185-187, Kotwica Polski Walczącej (8.10.1994; Warszawa).
    S. 188, Pomnik "Pamięci Walczących o Wolność i Niepodległość Rzeczypospolitej w 50. Rocznicę Sierpnia 1944 r." (1994; Warszawa).
    S. 199-200, Pomnik RAF-u (Royal Air Forces) (1997; Warszawa).
    S. 200-201, Pomnik ku Czci Żołnierzy 1. Batalionu Szturmowego "Nałęcz" Armii Krajowej (31.07.1998; Warszawa).
    S. 208-213, Pomnik Polskiego Państwa Podziemnego i Armii Krajowej (10.06.1999; Warszawa).
    S. 213-214, Pomnik Najmłodszym Żołnierzom Powstania Warszawskiego 1944 2.10.1999; Warszawa).
    Rec.: Zdobią i straszą / Dariusz Bartoszewicz.
    Dostawca treści:
    Bibliografia CBW
    Książka
      Wyświetlanie 1-70 z 70

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