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

• Main Author: S. P. Repetskyi, V. B. Molodkin, I. G. Vyshyvana, E. G. Len, I. M. Melnyk, O. I. Musienko, B. V. Stashchuk
• Format: Article
• Language: English
• Published: G. V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine 2009-09-01
• Series: Успехи физики металлов
• Online Access: https://doi.org/10.15407/ufm.10.03.283
• ISSN: 1608-1021; 2617-0795

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.