Effective three-band model for double perovskites

Details Effective three-band model for double perovskites Effective three-band model for double perovskites

2002-07-12

arxiv.org/abs/cond-mat/0207325v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 3 figures

Scientific paper

10.1103/PhysRevB.66.104418

We start from a six-band model describing the transition-metal t2g orbitals of half-metallic double perovskite systems, such as Sr2FeMoO6, in which only one of the transition metal ions (Fe) contains important intratomic repulsion Ufe. By eliminating the Mo orbitals using a low-energy reduction similar to that used in the cuprates, we construct a Hamiltonian which contains only effective t2g Fe orbitals. This allows to treat exactly Ufe, and most of the Fe-Mo hopping. As an application, we treat the effective Hamiltonian in the slave-boson mean-field approximation and calculate the position of the metal-insulator transition and other quantities as a function of pressure or on-site energy difference.

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