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    Wyświetlanie 1-6 z 6
    Tytuł:
    Electrical Conductivity for the Strongly Correlated and Hybridized Hubbard Band
    Autorzy:
    Kosimow, R.
    Borgieł, W.
    Deniszczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013654.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    71.27.+a
    72.10.-d
    72.15.-v
    Opis:
    The magnetic and electrical transport properties of strongly correlated Hubbard band (f-band) hybridizing with the non-correlated conduction band (c-band) was studied. The many-body model Hamiltonian was treated within the modified alloy analogy scheme and the resulting one-body problem was solved with the use of coherent potential approximation. Within the Kubo-Greenwood formalism the dc electrical conductivity for bcc magnetic system was calculated and its variation with temperature and number of electrons was examined for different values of the Coulomb and hybridization (V) coupling constants. We found that the effect of strong correlations and hybridization on the conductivity is similar to that produced by the scattering due to the s-f interaction (spin disorder resistivity).
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 799-802
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metal-Dielectric Transition in Hydrogen
    Autorzy:
    Shvets, V.
    Vlasenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812049.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.-d
    72.15.-v
    72.15.Cz
    72.15.Lh
    Opis:
    The electrical resistivity of liquid metallic hydrogen at a temperature of 3000 K and a density of 0.35 mol/$cm^3$ is calculated. Hydrogen is considered as a three-component system consisting of electrons, protons, and neutral hydrogen atoms. The second order of perturbation theory in electron-proton and electron-atom interactions is used to determine the inverse relaxation time for electric conductivity. The Coulomb electron-electron interaction is taken into account in the random phase approximation and the exchange interaction and correlation of conductivity electrons are included in the local-field approximation. The model of hard spheres is used for the proton and atomic subsystems. The concentration of the electrically neutral atomic component proved to be significantly lower than the value assumed by the discoverers of metallic hydrogen.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 851-858
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure and Electron-Transport Properties of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In Compounds
    Autorzy:
    Borgieł, W.
    Deniszczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013400.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.-d
    72.15.-v
    71.20.Eh
    71.20.-b
    Opis:
    Based on the electronic structure of the ferromagnetic Gd$\text{}_{2}$In and (Gd$\text{}_{0.5}$ Y$\text{}_{0.5}$)$\text{}_{2}$In compounds the high-temperature magnetic part of the electrical resistivity of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In as a function of Y concentration was calculated and analyzed. The main interaction which causes the finite magnetic part of the conductivity was assumed in a form of stochastically distributed in space s-f interaction. The calculated resistivity of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In alloys qualitatively reproduces the experimental data.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 783-786
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resistivity of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In Alloys at High Temperatures - Two-Band Model Approach
    Autorzy:
    Borgieł, W.
    Deniszczyk, J.
    Lipowczan, M.
    Braun, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014412.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    71.20.-b
    72.15.-v
    72.10.-d
    Opis:
    Two-band model for the substitutionary binary alloy of different rare earth metals with relatively simple 4f multiplet structure placed within the transition metal host matrix was proposed and applied to (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In. The main interaction which causes the magnetic part of the resistivity was assumed in a form of stochastically distributed in space s-f interaction. The calculated high temperature spin disorder resistivity of (Gd$\text{}_{1-x}$Y$\text{}_{x}$)$\text{}_{2}$In alloys reproduces well the experimental alloys data.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 547-550
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Band Structure and Magnetic Properties of DO$\text{}_{3}$-Type Fe$\text{}_{3-x}$V$\text{}_{x}$Al Alloys. Super-Cell Approach
    Autorzy:
    Deniszczyk, J.
    Borgieł, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014414.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    71.20.-b
    72.15.-v
    72.10.-d
    Opis:
    The electronic structure of Fe$\text{}_{3-x}$V$\text{}_{x}$Al alloys was calculated using the super-cell methodology of alloy modeling. The concentration range of x=0.0÷1.0 was investigated. For a concentration of x=0.0625 the energy based analysis reveals that vanadium prefers to replace the Fe atom at sites with the octahedral coordination. It was found that the iron atoms coordinated by the eight nearest-neighbor Fe atoms preserve their high magnetic moment up to a concentration of x=0.9375 even though the average total magnetic moment goes to zero. The relatively high (≃ -1.0μB) negative magnetic moment of V remains constant up to x≃ 0.5. In the concentration range of x=0.75÷0.9375 the gap at ε$\text{}_{F}$ of the minority density of states is observed while the majority density of states displays a sharp peak structure at the Fermi energy. This feature suggests the heavy-fermion behavior of the Fe$\text{}_{2}$VAl compound.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 551-554
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Chemical Composition of Liquid Phase and Growth Process on Physical Properties of $Bi_2Se_3,$ $Bi_2Te_3$ and $Bi_2Te_2Se$ Compounds
    Autorzy:
    Hruban, A.
    Materna, A.
    Dalecki, W.
    Strzelecka, G.
    Piersa, M.
    Jurkiewicz-Wegner, E.
    Diduszko, R.
    Romaniec, M.
    Orłowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492965.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    72.10.-d
    72.15.-v
    72.20.-I
    73.20.-r
    Opis:
    We studied synthesis and crystal growth of $Bi_2Te_3,$ $Bi_2Se_3$ and $Bi_2Te_2Se$ compounds by means of vertical Bridgman method. Crystals were grown from stoichiometric melts and under different molar ratio of Bi:Te, Bi:Se or Bi:Te:Se. The obtained crystals were characterized by X-ray diffraction analysis, energy dispersive X-ray spectroscopy, scanning electron microscopy, atomic force microscopy, and the Hall effect measurements. Some of the samples demonstrated insulating bulk behavior, by means of resistivity versus temperature measurements.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 950-953
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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