A Magnetic Model for the Ordered Double Perovskites

Details A Magnetic Model for the Ordered Double Perovskites A Magnetic Model for the Ordered Double Perovskites

2008-12-05

arxiv.org/abs/0812.1182v1

Phys. Rev. B 80, 054411 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages latex, 10 figs

Scientific paper

We construct an effective spin model from the coupled spin-fermion problem appropriate to double perovskites of the form A_2BB'O_6. The magnetic model that emerges is reminiscent of double exchange and we illustrate this `reduction' in detail for the case of perfect B-B' structural order, i.e, no antisite disorder. We estimate the effective exchange between the magnetic B ions in terms of the electronic parameters, study the `classical' magnetic model using Monte Carlo techniques, and compare this approach to a full numerical solution of the spin-fermion problem. The agreement is reasonable, and promises a quick estimate of magnetic properties when coupled with ab initio electronic structure. The scheme generalises to the presence of antisite disorder.

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