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    Tytuł:
    Solitons in a One-Dimensional Degenerate Hubbard Model
    Autorzy:
    Lipiński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1888014.pdf
    Data publikacji:
    1991-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    71.10.+x
    Opis:
    An effective magnon-lattice Hamiltonian for the degenerate Hubbard chain with electron-phonon interaction is derived and a formalism for the description of solitary magnons is presented.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 1; 117-128
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shallow-Deep Instability of Donor States in Many-Valley Semiconductors
    Autorzy:
    Grinberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890895.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    71.38.+i
    Opis:
    The shallow-deep instability of double and single donors in multi-valley semi conductors using the model Hamiltonian is studied. The obtained results describe properly the properties of double donors (in D$\text{}^{0}$ and D$\text{}^{+}$ state) in Ge and single deep donors in Al$\text{}_{x}$Ga$\text{}_{1-x}$As for 0.3 < x < 0.5.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 361-364
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ground State Phase Diagram of Mixed-Stack Compounds with Intermolecular Electron Transfer
    Autorzy:
    Luty, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1933456.pdf
    Data publikacji:
    1995-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    71.35.+z
    Opis:
    The ground state energy for a chain of donor and acceptor molecules (mixed-stack architecture) is calculated within the three-state model. The model describes the intermolecular electron transfer and, in particular, stresses the role of the diagonal coupling of the electron to symmetry breaking molecular displacements and the local electric field. The modulation of the intermolecular Coulomb interaction is shown to have important consequences for the ground state and its dynamics. In particular, the ground state energy as a function of the displacement may show one, two or three minima with varied molecular ionicity. An analysis of the function gives a phase diagram which indicates a possibility for the coexistence of neutral (undistorted) and ionic (distorted) chains of molecules in the ground state. The function is illustrated by numerical calculations with parameters appropriate for the tetrathiafulvalene-chloranil crystal which undergoes a neutral-to-ionic phase transition induced by either temperature or pressure. The effect of the electron transfer on the lattice dynamics of the mixed-stack system is briefly considered. It is suggested that the thermodynamical phase diagram for tetrathiafulvalene-chloranil system can be understood as a result of two effects: pressure induced quantum mixing between diabatic states which determine a nature of components and temperature stimulated classical mixing of the components.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 6; 1009-1021
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Photomemory Effect in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$:In for Direct Measurements of Magnetization of Bound Magnetic Polarons
    Autorzy:
    Wojtowicz, T.
    Koleśnik, S.
    Miotkowski, I.
    Furdyna, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1921550.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    75.50.Pp
    Opis:
    The first direct measurement of the magnetization of donor bound magnetic polarons in diluted magnetic semiconductors is reported. The experiment has been performed taking advantage of photomemory effect found in n-type Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ crystals doped with In. Good agreement between experimental results and theory of bound magnetic polarons is observed.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 637-640
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shallow Donors and Acceptors in GaN; Bound Excitons and Pair Spectra
    Autorzy:
    Stępniewski, R.
    Wysmołek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1946873.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.-y
    71.55.Eq
    71.38.+i
    Opis:
    Recent photoluminescence results obtained for homoepitaxial GaN layers are presented. Dominant photoluminescence structures observed for these layers can be assigned to excitons bound to neutral impurities. Different methods such as temperature dependent evolution, high magnetic field and time resolved spectroscopy have been used to study the exciton line properties. For the p-type samples sharp lines are observed, assigned to the donor-acceptor recombination for differently distant pairs. The analysis of the optical transitions related to donors and acceptors is in reasonable agreement with the effective mass approximation. Electron phonon interaction was found to strongly affect the optical properties of GaN. The dominant intrinsic defect has been identified as a donor located at a nitrogen site.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 681-690
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Anharmonic Polaronic Model
    Autorzy:
    Konior, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1923721.pdf
    Data publikacji:
    1992-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    74.20.-z
    33.10.Cs
    Opis:
    Anharmonic polaronic model is considered. The model consists of the electronic subsystem, described within the extended Hubbard model, coupled to anharmonic local phonons. By the canonical Holstein-Lang-Firsov transformation the electron-phonon interaction term is ruled out and, then, the effective electronic Hamiltonian is obtained by averaging over the ground state of the phononic subsystem. It is shown that anharmonicity introduces two main additional factors as compared with the harmonic case. First, the band narrowing factor is less rapidly decaying function of the electron-phonon interaction strength. Second, anharmonicity introduces further renormalization of the on- and intersite interaction between fermions.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 5; 773-776
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excitonic Instabilities of Deformable Lattice - from Self-Trapping to Phase Transition
    Autorzy:
    Toyozawa, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931862.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.60.-i
    71.35.+z
    71.38.+i
    Opis:
    The optically created exciton will be self-trapped if its coupling to phonons is strong enough, and will moreover be self-decomposed if the electron and the hole couple to phonons in an opposite way. The bistability between the parity-conserved and parity-broken self-trapped excitons was observed in alkali halides. The situation is most dramatic if the bistability between the parity-broken self-trapped exciton and the ground state (with no exciton) comes into play since the electron-hole pairs may then be spontaneously generated at every lattice site, resulting in the electronic and structural phase transition. The neutral to ionic phase transition observed in a few organic charge transfer compounds under applied pressure or decreasing temperature can be considered as an example. Recent experiment revealed that TTF-chloranil, among others, is subject to photo-induced transient phase change over hundreds of unit cells per one photon. The dynamics of this process can be described in terms of self-trapping and self-multiplication of a photo-generated charge transfer exciton along the chain through the attractive dipolar interaction. This description of phase transition in terms of exciton dynamics will provide a new paradigm of materiology.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 47-56
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards a Unified View of Electron-Phonon Coupling in 1D Solids
    Autorzy:
    Girlando, A.
    Painelli, A.
    Soos, Z. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933319.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    71.27.+a
    71.45.Lr
    Opis:
    We analyze the effect of on-site and on-bond electron-phonon (e-ph) coupling in different classes of quasi one-dimensional (1D) solids in terms of a single model. The model was originally developed to account for e-ph coupling in charge transfer crystals and to interpret their vibrational spectra. The same model is extended to conjugated polymers, showing that important information about the electronic structure can be obtained through a careful analysis of vibrational data. Evidence of e-ph coupling in the spectra of halogen-bridged transition-metal complexes is also presented. The unified model thus applies to different classes of 1D systems and yields transferable e-ph coupling constants.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 735-742
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Polaron Scenario for High-T$\text{}_{c}$ Superconductivity
    Autorzy:
    Ranninger, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1860957.pdf
    Data publikacji:
    1994-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.+z
    71.38.+i
    67.20.+k
    Opis:
    On the basis of experimental evidence we conclude that high-T$\text{}_{c}$ superconducting materials are composed of two distinct subsystems: one in which electrons are bound together in form of localized pairs of small polarons (bipolarons) and one in which electrons exist as strongly correlated Fermions. Upon doping one passes at a critical doping rate from the insulating parent compounds to metallic compounds. There, a charge transfer mechanism between the two subsystems sets in abruptly by which bipolarons can decay into pairs of electrons and vice versa. Such a picture can be modelled by a mixture of interacting Bosons and Fermions. A superconducting ground state for such a system develops at low temperature which is characterized by the opening of a gap in the single electron spectrum and the appearance of collective Boson excitations with a linear spectrum which is confined to the energy regime of the gap. Above T$\text{}_{c}$, a pseudo-gap remains upon closing the superconducting gap. There are strong indications that the normal state has non Fermi liquid behaviour.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 1; 89-102
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polaron Problem in Quantum Wells
    Autorzy:
    Bardyszewski, W.
    Prywata, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934053.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    71.38.+i
    73.20.Dx
    Opis:
    The effect of polar interaction between an electron in a quantum well and bulk longitudinal optical phonons is analysed. Electron spectral density function is calculated in the lowest order cumulant approximation. The position and linewidth of the quasiparticle peak are obtained as a function of quantum well width and temperature.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 969-973
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of the DX State by Donors in Al$\text{}_{x}$Ga$\text{}_{1-x}$As - Experiment
    Autorzy:
    Dobaczewski, L.
    Kaczor, P.
    Missous, M.
    Żytkiewicz, Z. R.
    Dobosz, D.
    Peaker, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1924251.pdf
    Data publikacji:
    1992-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    71.55.Eq
    78.50.Ge
    Opis:
    A high-resolution Laplace-transform deep level transient spectroscopy was used to study electron emission from the DX centres related to group IV and VI donor elements in AlGaAs. This provides the experimental evidence that substitutional-interstitial atom motion is responsible for DX behaviour and for the associated metastability effects.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 5; 905-907
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering of Excitons by Phonons in Quantum Wells
    Autorzy:
    Bardyszewski, W.
    Prywata, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1947245.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    71.38.+i
    72.80.Ey
    Opis:
    A method to describe the effects of the exciton-optical phonon interaction is presented using the cumulant expansion approximation. The functional-integral technique of coherent phonon states is used in order to justify the commonly used model Hamiltonian and generate the proper perturbation series. The influence of the mutual electron-hole screening on the polaronic effects in quantum wells is analyzed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 715-718
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physics of Neutral-to-Ionic Phase Transition in Organic Charge Transfer Semiconducting Compounds
    Autorzy:
    Cailleau, H.
    Lemée-Cailleau, M. H.
    Le Cointe, M.
    Luty, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967953.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    61.50.Ks
    71.35.Aa
    Opis:
    An uncommon excitonic instability takes place in some exotic semiconducting compounds. Indeed, the equilibrium neutral-to-ionic (N-I) phase transition, as well as the non-equilibrium photo-induced phase transformation, observed in some organic charge-transfer complexes, originate from intra- and inter-chain cooperative effects between structurally relaxed charge-transfer excitations. This electronic-structural phase transition manifests itself by a change of the degree of charge-transfer and a dimerization distortion with the formation of donor-acceptor pairs along the stacking axis in the I phase. Thermal charge-transfer excitations associated with the formation of I strings along N chains are at the heart of the mechanism of this phase transition. These relaxed electronic excitations, which are an intrinsic feature of low-dimensional systems with strong electron-phonon coupling, can be described in terms of self-trapping and self-multiplication of charge-transfer excitons. Precise structural studies on the prototype compound, tetrathiafulvalene-p-chloranil allow to highlight the respective role taken by the ionicity and the dimerization. Symmetry and thermodynamics analysis of the N-I transition, based on recent determination of the pressure-temperature phase diagram, make possible to present a consistent picture of this phase transition. Supported by theoretical considerations taking into account the interplay between quantum and thermal effects, the experimental observations show that the N-I transition results from the condensation and the ordering (crystallization) of charge-transfer excitations, following a phase diagram analogous to the solid-liquid-gas one.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 597-608
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Investigations of Charge Transfer Salt VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$
    Autorzy:
    Łapiński, A.
    Świetlik, R.
    Strzelecka, H.
    Veber, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933382.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    78.30.Jw
    78.40.-q
    Opis:
    VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$ is a salt with two different, non-parallel TCNQ stacks. The polarized reflectance spectra from single crystals in the IR region 660-5200 cm$\text{}^{-1}$, the powder absorption spectra 400-45000 cm$\text{}^{-1}$ and FT-NIR Raman spectra of VINΦ$\text{}_{2}$(TCNQ)$\text{}_{2}$ are measured at room temperature. Moreover, the temperature dependence of powder absorption spectra in the frequency range 400-7900 cm$\text{}^{-1}$ are studied. The nature of electronic bands, the anisotropy of optical conductivity, the temperature dependence of some vibrational bands and the charge distribution on different TCNQ stacks are discussed.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 835-841
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polaron Effect on the Binding Energy of Shallow Donor in Cylindrical Quantum Dot
    Autorzy:
    Charrour, R.
    Bouhassoune, M.
    Bria, D.
    Nougaoui, A.
    Fliyou, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011186.pdf
    Data publikacji:
    1999-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    73.20.Dx
    73.20.Hb
    Opis:
    In the framework of the effective-mass approximation and the modified Lee-Low-Pines variational method, we present a theoretical study of the effect of the confined longitudinal-optical phonon and two types of surface-optical phonon (top and side mode) on the binding energy of shallow donor in cylindrical quantum dot. The effect of quantum confinement is described by an infinitely deep potential well. The impact of these different phonon modes is important and depends on the dimension of the quantum dot.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 6; 759-768
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Bound Magnetic Polarons on Magnetic and Electrical Properties in Metallic n-Cd$\text{}_{0.95}$Mn$\text{}_{0.05}$Se
    Autorzy:
    Głód, P.
    Sawicki, M.
    Dietl, T.
    Skośkiewicz, T.
    Lenard, A.
    Plesiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931936.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.30.+h
    71.38.+i
    75.20.Hr
    Opis:
    Doping-induced contribution to the millikelvin magnetic susceptibility of Cd$\text{}_{0.95}$Mn$\text{}_{0.05}$Se:In has been found to undergo a maximum at n ≈ 2n$\text{}_{c}$, and to vanish for n ≥ 8n$\text{}_{c}$, where n$\text{}_{c}$ is the electron concentration corresponding to the metal-insulator transition. This confirms the presence, also in the metallic phase, of bound magnetic polarons. Their slow dynamics may account for hysteresis visible in our magnetoresistance data.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 173-175
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Possible Scattering Processes for Bloch Positronium in Ionic Crystals at Elevated Temperatures
    Autorzy:
    Bondarev, I. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2024215.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.60.+z
    71.38.+i
    36.10.Dr
    Opis:
    The role of nonpolar optic phonon scattering and of umklapp acoustic phonon scattering is analyzed for a delocalized positronium atom in ionic crystals at elevated temperatures. At temperatures above which they become essential both of these scattering mechanisms contribute to the imaginary self-energy of positronium renormalizing its acoustic deformation potential constant. It was such a renormalization that was recently observed experimentally for delocalized positronium in MgF$\text{}_{2}$ crystal. We put forward the theoretical explanation of these experiments based upon the model of nonpolar optic phonon scattering of positronium. An effect analogous to that observed in MgF$\text{}_{2}$ is predicted for crystalline quartz above the temperature of (α-β)-phase transition.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 3-4; 337-343
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamics of Pseudospin-Electron Model in the U=0 Limit
    Autorzy:
    Stasyuk, I. V.
    Shvaika, A. M.
    Tabunshchyk, K. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013013.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    71.38.+i
    77.80.Bh
    63.20.Ry
    Opis:
    Analytical consideration of a pseudospin-electron model in the absence of electron correlations is presented. Pseudospin and electron number mean values, thermodynamic potential, pair correlation functions are obtained in the same self-consistent approximation. The possibility of either first or second order phase transitions between different uniform phases (bistability) as well as between the uniform and the chessboard one is shown. In the regime n=const, an instability with respect to phase separation can take place.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 411-414
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Binding Energy of a Bound Polaron in a Quantum Well Wire
    Autorzy:
    Bouhassoune, M.
    Charrour, R.
    Fliyou, M.
    Bria, D.
    Nougaoui, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014080.pdf
    Data publikacji:
    2000-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    73.20.Dx
    73.20.Hb
    73.20.Fz
    Opis:
    Theoretical study of the binding energies of an off-center donor hydrogenic impurity in a cylindrical quantum well wires semiconductor is presented. Calculations are performed in the framework of the effective mass approximation using the variational approach. We describe the effect of the quantum confinement by an infinitely deep potential well and we take into consideration the interaction between the charge carrier (electron and ion) and the optical phonons (confined longitudinal optical and surface optical). Our results show that the impurity binding energy depends strongly on the spatial confinement, the impurity position and the polaronic corrections.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 1-2; 111-122
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity of Positronium Momentum Distribution to Phase Transitions in Crystalline Dielectrics
    Autorzy:
    Bondarev, I. V.
    Hyodo, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042201.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.60.+z
    71.38.-k
    36.10.Dr
    Opis:
    We give a review of recent theoretical and experimental study of the positronium-phonon and positronium-quadrupole interactions in dielectric crystals of different local symmetries, placing a special emphasis on the sensitivity of the positronium momentum distribution to the second order phase transitions in crystalline dielectrics.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 673-684
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowoczesne materiały do spoinowania okładzin ceramicznych
    Autorzy:
    Borkowicz, Klaudiusz
    Nosal, Krzysztof
    Kasprzyk, Szymon
    Powiązania:
    https://bibliotekanauki.pl/articles/36081187.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
    Tematy:
    fuga
    metody badania
    wytrzymałość materiałowa
    grout
    test methods
    material strength
    Opis:
    Materiały do spoinowania powinny charakteryzować się odpowiednimi własnościami. Własności te zostały określone w normach międzynarodowych i europejskich. Niniejszy artykuł przybliża te wymagania oraz opisuje w jaki sposób nowo wprowadzany na rynek produkt powinien być przebadany.
    Grounts should have appropriate properties. These properties have been defined in international and European standards. This article introduces these requirements and describes how a newly introduced product should be tested.
    Źródło:
    Szkło i Ceramika; 2020, 71, 4; 35-38
    0039-8144
    Pojawia się w:
    Szkło i Ceramika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupling between Electronic and Vibrational Excitations in Carbon Nanotubes Filled with $C_{60}$ Fullerenes
    Autorzy:
    Utko, P.
    Ferone, R.
    Krive, I.
    Shekhter, R.
    Jonson, M.
    Monthioux, M.
    Noé, L.
    Nygård, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492807.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Fg
    73.63.Kv
    73.23.Hk
    73.22.Lp
    71.38.-k
    Opis:
    We investigate the low-temperature electron transport through $C_{60}$ peapods, which are carbon nanotubes encapsulating $C_{60}$ fullerenes. We find that the temperature dependence of the Coulomb blockade oscillations in peapod quantum dots deviates from conventional Breit-Wigner behavior, showing signatures of the Franck-Condon blockade of conductance. This indicates the presence of a coupling between electronic states and vibrational excitations. Unlike for suspended empty nanotubes, these are not intrinsic vibrational modes of the tube but mechanical vibrations of the encapsulated fullerenes that affect the electronic transport. Fullerene peapods thus emerge as a new class of nanoelectromechanical systems.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 839-841
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Transport Properties of La$\text{}_{0.75-x}$RE$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3}$ (RE = Gd, Dy, Ho; 0≤ x≤0.75) Manganites
    Autorzy:
    Drozd, V.
    Pękała, M.
    Kovac, J.
    Skorvanek, I.
    Szymański, M.
    Nedilko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041482.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    71.38.-k
    72.20.Ee
    75.50.Dd
    Opis:
    Structure and transport properties have been studied for a series of La$\text{}_{0.75-x}$RE$\text{}_{x}$Ca$\text{}_{0.25}$MnO$\text{}_{3}$ manganites with heavy rare earth ions of Gd, Dy, Ho substituting La with x=0, 0.10, 0.25, 0.50, and 0.75. Polycrystalline samples were prepared by the carbonate precipitation route. The oxygen content was determined by the iodometric titration. The X-ray investigations carried out by the powder method show that the unit cell volume gradually decreases and orthorhombic distortion of the lattice increases with rising RE content. Below the room temperature the electrical resistivity is of the semiconducting type for all the samples studied. Electrical resistivity vs. temperature dependences were analyzed within different models: simple thermal activation, Mott's variable range hopping, adiabatic, nonadiabatic, and bipolaron. The Curie temperatures of Gd, Dy, and Ho substituted manganites determined from magnetization measurements show that at 280 K all the samples are in the paramagnetic phase. The increasing RE fraction reduces magnetization at 4 K as compared to La$\text{}_{0.75}$Ca$\text{}_{0.25}$MnO$\text{}_{3}$.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 751-758
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza rozłożenia praw i obowiązków we wspólnotach w świetle złożonej korelacji kompensującej
    An Analysis of the Distribution of Rights and Duties in Communities in the Face of Complex Compensatory Correlation
    Autorzy:
    Stoiński, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/42561842.pdf
    Data publikacji:
    2024
    Wydawca:
    Stowarzyszenie Filozofii Prawa i Filozofii Społecznej – Sekcja Polska IVR
    Tematy:
    sprawiedliwość
    prawa
    obowiązki
    wspólnota
    Hohfeld
    złożona korelacja kompensująca
    justice
    rights
    duties
    community
    complex compensatory correlation
    Opis:
    W tekście badany jest rozkład uprawnień i obowiązków sprawiedliwości u podmiotów nierównorzędnych w ich wzajemnych relacjach we wspólnotach. Analizy prowadzone są w perspektywie złożonej korelacji kompensującej będącej dikaiologiczną modyfikacją Hohfeldiańskiego modelu korelacji prawnych. Pierwsza teza artykułu głosi, że koniecznym warunkiem sprawiedliwości, w relacjach we wspólnotach, będzie ułożenie praw i obowiązków podmiotów zgodne ze schematem korelacji kompensującej. Teza druga mówi, że zwiększeniu welfarystycznych praw pozytywnych niektórych obywateli towarzyszy wzrost praw rządu. Propozycje te skonfrontowano z obrazem uprawnień i obowiązków we wspólnocie rodzinnej i politycznej. U podmiotów w stosunkach rodzinnych oraz w niektórych relacjach we wspólnocie politycznej można dostrzec równoważenie się przypisanych im praw i obowiązków. Są jednak także takie interakcje, w których dochodzi do podwojenia obowiązków u jednych podmiotów i uprawnień u innych, a zatem nie odnajdziemy w nich schematu właściwego dla złożonej korelacji kompensującej. W takich przypadkach mamy więc do czynienia z niedostatkami w sferze sprawiedliwości.
    The article examines the distribution of rights and duties of justice among entities of unequal status in their mutual relations in communities. The analyses are performed from the perspective of complex compensatory correlation, which is a dicaiological modification of the Hohfeldian legal rights correlation model. The first thesis of the article asserts that alignment of the rights and duties of entities in accordance with the compensatory correlation scheme is a necessary condition for justice in community relations. The second thesis states that an increase in the welfarist positive rights of some citizens is accompanied by an increase in the rights of the government. These proposals are juxtaposed with the image of rights and duties within the family and political community. In the case of entities in family relationships and in some political community relations, one can observe a balance between the rights and duties assigned to them. However, there are also interactions in which some entities have double duties and others have double rights, and therefore, we cannot find there a pattern suitable for a complex compensatory correlation. In such cases, there are deficiencies in the sphere of justice.
    Źródło:
    Archiwum Filozofii Prawa i Filozofii Społecznej; 2024, 38, 1; 71-82
    2082-3304
    Pojawia się w:
    Archiwum Filozofii Prawa i Filozofii Społecznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-24 z 24

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