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Recently an antiferromagnetic metal phase has been proposed in doubleperovskites materials like Sr$_{2}$FeMoO$_{6}$ (SFMO), when electron doped.This material has been found to change from half-metallic ferromagnet toantiferromagnetic metal (AFM) upon La-overdoping. The original proposition ofsuch an AFM phase was made for clean samples, but the experimental realizationof La-overdoped SFMO has been found to contain a substantial fraction ofantisite defects. A phase segregation into alternate Fe and Mo rich regions wasobserved. In this paper we propose a possible scenario in which this type ofstrong antisite concentration can still result in an antiferromagnetic metalphase, by a novel hopping driven mechanism. Using variational calculations, wefind that proliferation of such phase segregated domain regions can also resultin the stabilization of an A-type AFM over the G-type AFM based on kineticenergy considerations.

Antiferromagnetic metal phases in double perovskites having strong antisite defect concentrations