Mean field theory for double-perovskites

Details Mean field theory for double-perovskites Mean field theory for double-perovskites

2006-03-06

arxiv.org/abs/cond-mat/0603143v1

Phys. Rev. B 74, 094429 (2006)

Physics

Condensed Matter

Materials Science

8 pages, including 4 figures

Scientific paper

10.1103/PhysRevB.74.094429

A mean field approximation of a model for double perovskites that takes into account the coupling between itinerant electron spins and localized spins is developed. As in previously reported theoretical results, and contrary to experimental observation, the critical temperature is suppressed for large electron density. An effective Heisenberg model reveals the cause of this discrepancy: the competition between degenerate antiferromagnetic and ferromagnetic channels. This degeneracy can be broken by the inclusion of a Hubbard-type U term. It is therefore suggested that electron correlation effects need to be incorporated in the minimal model of double perovskites in order to explain the experimental observation of increasing ferromagnetic critical temperature with increasing electron doping.

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