2001/02/27 by L. Didukh, Yu. Skorenkyy, Yuriy Skorenkyy +3
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.64.144428
13 pages, 11 eps figures
arxiv created 2001/02/27 · openalex publication_date 2001/09/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
In the present paper the ground state of a doubly orbitally degenerate model at weak intra-atomic interaction is studied using the Green function method. Besides the diagonal matrix elements of electron-electron interactions the model includes correlated hopping integrals and interatomic exchange interaction. The influence of orbital degeneracy with Hund's rule coupling, correlated hopping and interatomic direct exchange on the ferromagnetic ordering is investigated. The expressions for ground-state energy and magnetization, the criterion of transition from paramagnetic to ferromagnetic ground state as functions of the model parameters are obtained. The obtained results are compared with some experimental data for magnetic materials.