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Wyświetlanie 16-30 z 42
Tytuł:
A Comparison of the Valence Band Structure of Bulk and Epitaxial GeTe-based Diluted Magnetic Semiconductors
Autorzy:
Pietrzyk, M.
Kowalski, B.
Orlowski, B.
Knoff, W.
Story, T.
Dobrowolski, W.
Slynko, V.
Slynko, E.
Johnson, R.
Powiązania:
https://bibliotekanauki.pl/articles/1538868.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Mq
71.20.Be
Opis:
In this work we present a comparison of the experimental results, which have been obtained by the resonant photoelectron spectroscopy for a set of selected diluted magnetic semiconductors based on GeTe, doped with manganese. The photoemission spectra are acquired for the photon energy range of 40-60 eV, corresponding to the Mn 3p → 3d resonances. The spectral features related to Mn 3d states are revealed in the emission from the valence band. The Mn 3d states contribution manifests itself in the whole valence band with a maximum at the binding energy of 3.8 eV.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 293-295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling Thermal Expansion of $Ni_{2}MnGe$
Autorzy:
Pugaczowa-Michalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1810454.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
71.20.Be
65.40.De
Opis:
The present study of $Ni_{2}MnGe$ is focused on describing the thermal properties of the alloy in the framework of first-principles electronic structure calculations coupled with a Debye treatment of the vibrating lattice. The electronic structure of $Ni_{2}MnGe$ has been studied using the full-potential nonorthogonal local-orbital minimum basis method. Two approximations for Grüneisen parameter γ, i.e. Slater's and Dugdale and MacDonald's expressions were assumed.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 194-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Small Pt Doping on the Electronic Structure of NiMnSb Half-Heusler Alloys
Autorzy:
Pugaczowa-Michalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2035739.pdf
Data publikacji:
2003-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.20.Be
75.50.-y
Opis:
The effect of small Pt doping on the electronic and magnetic properties of NiMnSb compound were studied using the spin-polarised tight-binding linear muffin-tin orbital method. The electronic structure of half-Heusler alloys depends on the relative arrangement of the atoms in the unit cell, changing from half-metal to metal. The local ordering drastically influences the value of the band gap. The self-consistent band calculations were performed for the experimental lattice constant and for the lattice parameter estimated from the minimum of the total energy.
Źródło:
Acta Physica Polonica A; 2003, 103, 4; 393-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interatomic Pair Interaction in Liquid Transition Metals
Autorzy:
Dubinin, N.
Powiązania:
https://bibliotekanauki.pl/articles/1808052.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Mv
71.15.Dx
71.20.Be
Opis:
The Wills-Harrison pair interaction is investigated for liquid Fe on the base of the introduced relation between parameters of the model pseudopotential and d-electron characteristics. It is shown that the procedure suggested leads to the significant shift of the first minimum of the pair potential and increases the softness of its repulsive part.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 783-785
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoluminescence Studies of GaN:Fe
Autorzy:
Niedźwiadek, A.
Wysmołek, A.
Wasik, D.
Potemski, M.
Szczytko, J.
Kamińska, M.
Twardowski, A.
Łucznik, B.
Pastuszka, B.
Grzegory, I.
Powiązania:
https://bibliotekanauki.pl/articles/2047373.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
71.55.Eq
71.20.Be
Opis:
We report on magneto-optical studies on iron doped GaN crystals grown using hydride vapor phase epitaxy method on bulk GaN substrate. The investigated samples showed an intensive 1.3 eV luminescence band, characteristic of Fe$\text{}^{3+}$(d$\text{}^{5}$) center in GaN. A high quality of the investigated samples allowed us to observe a well-resolved fine structure of intracenter transitions between $\text{}^{4}$T$\text{}_{1}$(G) and $\text{}^{6}$A$\text{}_{1}$(S) states, consisting of four sharp no-phonon lines. All the observed no-phonon lines showed pronounced splittings in magnetic field. From the analysis of the magneto-optical data, the structure of split $\text{}^{4}$T$\text{}_{1}$(G) multiplet in the magnetic field applied along c-axis of GaN crystals was established.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 177-182
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Core-Hole Screening on Spin-Polarised Auger Spectra from Ferromagnetic Ni
Autorzy:
Wegner, T.
Potthoff, M.
Nolting, W.
Powiązania:
https://bibliotekanauki.pl/articles/2013223.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Fv
71.20.Be
75.60.Ej
Opis:
We calculate the spin- and temperature-dependent local density of states for ferromagnetic Ni in the presence of a core hole at a distinguished site in the lattice. Correlations among the valence electrons and between valence and core electrons are described within a multi-band Hubbard model which is treated by means of second-order perturbation theory around the Hartree-Fock solution. The core-hole potential causes strong screening effects in the Ni valence band. The local magnetic moment is found to be decreased by a factor of 5-6. The consequences for the spin polarisation of CVV Auger electrons are discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 567-570
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Noncollinear Magnetic Order on the Hyperfine Interactions in $Pt_{3}Fe$
Autorzy:
Woźniakowski, A.
Deniszczyk, J.
Szymański, K.
Powiązania:
https://bibliotekanauki.pl/articles/1506637.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
71.20.Lp
75.50.Bp
76.80.+y
Opis:
The investigations of the hyperfine interactions in $Pt_{3}Fe$ with the noncollinear magnetic order by means of ab initio methods are presented. It is shown that the ground state magnetic order of $Pt_{3}Fe$ is of noncollinear character. Electric field gradient and hyperfine magnetic field at $\text{}^{57}Fe$ nucleus were calculated and their dependence on the strength of Coulomb correlation interaction is discussed. The calculated values of electric field gradient correspond with the experimental data and the best agreement was found when the enhanced Coulomb correlation interaction for 3d-states of Fe was considered. Lattice, local valence electron (3d, 4p) and weakly bound 3p semicore electron contributions to electric field gradient are separated out and discussed.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 65-67
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study of Substitution of Si for Ge in Mn$\text{}_{5}$Ge$\text{}_{3}$
Autorzy:
Siberchicot, B.
Henrion, R.
Toboła, J.
Powiązania:
https://bibliotekanauki.pl/articles/1956494.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
75.50.Cc
75.10.Lp
Opis:
The substitution of silicon for germanium in Mn$\text{}_{5}$Ge$\text{}_{3}$ leads to a decrease in the magnetization for x < 0.7 and then to phase transition toward a non-collinear antiferromagnetic order for Mn$\text{}_{5}$Si$\text{}_{3}$. The magnetic properties of Mn$\text{}_{5}$Ge$\text{}_{3}$ and Mn$\text{}_{5}$(Ge$\text{}_{0.5}$Si$\text{}_{0.5}$)$\text{}_{3}$ are analyzed by means of band structure calculations.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 467-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C$\text{}_{11}$H$\text{}_{10}$N$\text{}_{2}$O)$\text{}_{2}$Ni(CN)$\text{}_{4}$
Autorzy:
Čizmár, E.
Černák, J.
Orendáč, M.
Herrmannsdörfer, T.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/2013230.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
71.20.Be
75.50.Ee
Opis:
In this paper we discuss the results of experimental studies of specific heat and magnetic susceptibility of chain compound Ni(C$\text{}_{11}$H$\text{}_{10}$N$\text{}_{2}$O)$\text{}_{2}$Ni(CN)$\text{}_{4}$. We have observed a Schottky type anomaly at T=2.2 K in a temperature dependence of specific heat and the compound was identified as a S=1 Heisenberg antiferromagnetic chain with the subcritical exchange coupling D/k$\text{}_{B}$=5 K, D/|J|=5.2 and the strong in-plane anisotropy E/k$\text{}_{B}$=2.8 K. It has been found that the in-plane anisotropy affects the region of validity of a diluted exciton model [1] and a strong coupling model [2] for S=1 Heisenberg chains with the strong planar anisotropy. The analysis suggests that the in-plane anisotropy should be considered in any attempt to find a compound potentially located in the boundary of Haldane and "large-D" phases.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 579-582
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interplay of Crystal Structure Preference and Magnetic Ordering in High Entropy CrCoFeNiAl Alloys
Autorzy:
Jasiewicz, K.
Kaprzyk, S.
Tobola, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030461.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Nc
71.20.Be
71.23.-k
75.50.Bb
Opis:
In this work, some relations between crystal structure and magnetic ordering in CrCoFeNiAl HEAs are discussed in view of the KKR-CPA calculations. Remarkably, it is noticed that the transition between fcc and bcc phases in the analysed CrCoFeNi_{x}Al and CrCoFeNiAl_{x} alloys is closely related to change in ordering of the local magnetic moments, namely the magnetic moment on Cr is either parallel (ferromagnetic) or antiparallel (ferrimagnetic) to the magnetic moments of other atoms (Co, Fe and Ni). On the whole, the theoretical diagram showing the fcc-bcc phase preference and their coexistence vs. alloy composition well corroborates with available experimental data.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 511-513
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First Principles Study of Stability and Electronic Structure οf TMH and $TMH_2$ (TM = Y, Zr, Nb)
Autorzy:
Kanagaprabha, S.
Asvinimeenaatci, A.
Sudhapriyanga, G.
JemmyCinthia, A.
Rajeswarapalanichamy, R.
Iyakutti, K.
Powiązania:
https://bibliotekanauki.pl/articles/1400404.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
71.15.Mb
73.20.At
62.20.de
Opis:
First principles calculations are performed by using Vienna ab initio simulation package within the framework of density functional theory to understand the electronic and structural properties of yttrium, zirconium and niobium hydrides. The equilibrium lattice constant, the bulk modulus, the total density of states and charge density distribution are analyzed in comparison with the available experimental and theoretical data. The X-ray diffraction pattern is also simulated to estimate the lattice constants of these hydrides. The formation energies are computed for rock-salt and fluorite structures using density functional theory. The calculated elastic constants obey the necessary stability conditions. A detailed analysis of the changes in density of states and electron density upon hydride formation has allowed us to understand the formation of these hydrides.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 126-131
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study of Compressibility of $Ni_2MnX$ (X=In, Sn, Sb) Heusler Alloys
Autorzy:
Pugaczowa-Michalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813962.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.20.Be
75.20.En
75.50.Cc
Opis:
The present study is focused on the compressibility of $Ni_2MnX$ (X = In, Sn, Sb) Heusler alloys, which were investigated from the first principles. The study of the pressure effect on the magnetic properties of $Ni_2MnX$ (X = In, Sn, Sb) predicted the decrease in the total magnetic moment from ambient pressure to pressure above 20 GPa.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 629-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab Initio Study of the $\text{}^{57}Fe$ Electric Field Gradient in $(FeAl)_{1-x}T_x$ (T = 3d Element) Dilute Alloys with B2-Type Structure
Autorzy:
Michalecki, T.
Hanc, A.
Deniszczyk, J.
Borgieł, W.
Powiązania:
https://bibliotekanauki.pl/articles/1811576.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
71.20.Lp
75.50.Bb
76.80.+y
Opis:
We present an ab initio study of the electric field gradient at Fe nuclei in the series of $(FeAl)_{1-x}T_x$ dilute alloys with B2-type crystal structure. The ternary additions T, of concentration x ≈ 0.06, from the group of 3d-type transition metals (Ti, V, Cr, Mn, Co, Ni, Cu) are considered. Lattice, local valence electron (3d, 4p) and weakly bound 3p core electron contributions to electric field gradient are separated out and discussed in the context of the T-atom site preference and changes of the electronic structure upon alloying. Contrary to earlier reports, we found that for most Fe nuclei the dominant contribution comes from the d-type valence electrons cancelled partially by the 3p and 4p electric field gradients which are both of opposite sign to that of the 3d one. The shielding effect of 3p semicore electrons is found and related to the electric field gradient contributed by the local valence electrons.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1483-1491
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Investigations of Selected Materials by Low-Energy Ion Scattering Technique
Autorzy:
Goc-Jagło, D.
Sitko, D.
Jagło, G.
Kim-Ngan, N.-T. H.
Soszka, W.
Powiązania:
https://bibliotekanauki.pl/articles/2047339.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Rh
71.20.Be
71.20.Eh
77.80.Bh
Opis:
Surfaces of three selected materials were investigated by means of low-energy ion-scattering technique: (1) the magnetite (Fe$\text{}_{3}$O$\text{}_{4}$) exhibiting the so-called Verwey transition (T$\text{}_{V}$(bulk)=125 K) accompanied by a small cubic-monoclinic crystal distortion, (2) the intermetallic compound NdMn$\text{}_{2}$ undergoing an antiferromagnetic-paramagnetic phase transition (T$\text{}_{N}$=104 K) accompanied by a large crystal distortion with a volume change of 1%, and (3) the typical insulator BaTiO$\text{}_{3}$ with two structural transitions below 300 K. The primary energy of the (Ne$\text{}^{+}$, Ar$\text{}^{+}$) ion beam was in the range of 4-8 keV, and the low-energy ion-scattering spectra were collected in the temperature range of 85-300 K. A large influence from the Verwey transition on the neutralization and re-ionization of scattered ions from magnetite surface was observed, while no visible change at the magnetic phase transition in NdMn$\text{}_{2}$ was revealed in the low-energy ion-scattering spectra. A strong dependence of the characteristics of the low-energy ion-scattering spectra on the irradiated time was observed for BaTiO$\text{}_{3}$ indicating that this surface was heavily charged by ion bombardments.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 763-771
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic and Magnetic Properties of $Co_{3}V_{2}O_{8}$ Compound
Autorzy:
Jezierski, A.
Szymczak, R.
Szymczak, H.
Kaczkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1810487.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.15.-m
71.15.Ap
71.15.Mb
71.20.Be
Opis:
The band structures and the magnetic properties of $Co_{3}V_{2}O_{8}$ compound have been calculated by ab initio scalar-relativistic full potential local orbital method within the local spin density approximation. The band calculations were performed for para-, ferro-, and antiferromagnetic $Co_{3}V_{2}O_{8}$ compounds. The main contribution to the density of states at the Fermi energy comes from minority 3d states of cobalt atoms.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 238-240
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 16-30 z 42

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