Ground state ferromagnetism in a doubly orbitally degenerate model

Details Ground state ferromagnetism in a doubly orbitally degenerate model Ground state ferromagnetism in a doubly orbitally degenerate model

2001-02-27

arxiv.org/abs/cond-mat/0102495v1

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 11 eps figures

Scientific paper

10.1103/PhysRevB.64.144428

In the present paper the ground state of a double orbitally degenerate model at weak intra-atomic interaction is studied using the Green functions method. Beside the diagonal matrix elements of electron-electron interactions the model includes correlated hopping integrals and inter-atomic exchange interaction. The influence of orbital degeneracy with Hund's rule coupling, correlated hopping and inter-atomic 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.

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