Microscopic model, spin wave theory and competing orders in the double perovskites

Details Microscopic model, spin wave theory and competing orders in the double perovskites Microscopic model, spin wave theory and competing orders in the double perovskites

2002-08-29

arxiv.org/abs/cond-mat/0208586v3

Phys. Rev. B 68, 092401 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

final version, to appear in PRB

Scientific paper

10.1103/PhysRevB.68.092401

We present a microscopic theory of carrier-induced ferrimagnetism in metallic double perovskite compounds such as ${\rm Sr}_{2}{\rm FeMoO}_{6}$ and ${\rm Sr}_{2}{\rm FeReO}_{6}$ which have recently attracted intense interest for their possible applications to magnetotransport devices. The theory is based on an effective "Kondo-like" Hamiltonian treated here within the large-$S$ expansion. We find that depending on the value of the carrier density the ground state is either a ferrimagnet or a layered antiferromagnet. The ferrimagnetic state has a robust half-metallic electronic structure. The transition to antiferromagnetic phase is first order accompanied with the regime of phase separation. We study spin wave spectrum including quantum corrections and find strongly enhanced quantum effects in the vicinity of zero-temperature phase transition.

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