Issues »  Volume 10, Issue 3

Energy Spectrum and Electrical Conductivity of Systems with the Strong Electronic Correlations

S. P. Repetskyi$^{1,2}$, V. B. Molodkin$^{1,2}$, I. G. Vyshyvana$^{2}$, E. G. Len$^{1}$, I. M. Melnyk$^{1}$, O. I. Musienko$^{2}$, B. V. Stashchuk$^{2}$

$^1$G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^2$Taras Shevchenko National University of Kyiv, 60 Volodymyrska Str., UA-01033 Kyiv, Ukraine

Received: 02.03.2009. Download: PDF

Theory of electroconductivity in crystals with strong electron correlations is developed. Different approaches for description of disordered-systems’ electroconductivity are considered. The method of two-particle Green’s function (electroconductivity) calculation for disordered crystals is developed. The processes of electron scattering on spin and density fluctuations, ion-core potentials and vibrations of a crystal lattice are taken into account. Calculations are based on a diagram technique for temperature Green’s functions. The cluster expansion for two-particle Green function is obtained. The coherent-potential approximation is chosen as a zeroth-order one-site approximation in above-mentioned cluster expansion. The energy spectrum of electrons, atomic and magnetic orderings, optical conductivity, temperature and concentration dependences of electroresistance and spin-dependent transport of Fe–Co alloy are investigated.

Keywords: energy spectrum, electron density, localized magnetic moments, atomic and magnetic ordering, electrical conductivity, spin-dependent transport, Green’s functions, Fermi level.

PACS: 71.15.Ap, 71.20.Be, 71.27.+a, 71.28.+d, 72.10.-d, 75.30.-m, 75.40.-s

DOI: https://doi.org/10.15407/ufm.10.03.283

Citation: S. P. Repetskyi, V. B. Molodkin, I. G. Vyshyvana, E. G. Len, I. M. Melnyk, O. I. Musienko, and B. V. Stashchuk, Energy Spectrum and Electrical Conductivity of Systems with the Strong Electronic Correlations, Usp. Fiz. Met., 10, No. 3: 283—330 (2009) (in Russian), doi: 10.15407/ufm.10.03.283

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Cited By (1)
  1. V. V. Lizunov, E. G. Len, I. M. Melnyk, M. V. Ushakov et al., Metallofiz. Noveishie Tekhnol. 36, 575 (2016).

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