Theory of half-metallic ferrimagnetism in double perovskites

Onur Erten, O. Nganba Meetei, Anamitra Mukherjee, Mohit Randeria, Nandini Trivedi, Patrick Woodward

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Abstract

Double perovskites such as Sr 2FeMoO 6 are rare examples of materials with half-metallic ground states and a ferrimagnetic T c above room temperature. We present a comprehensive theory of the temperature and disorder dependence of their magnetic properties by deriving and validating a new effective spin Hamiltonian for these materials, amenable to large-scale three-dimensional simulations. We show how disorder, ubiquitous in these materials, affects T c, the magnetization, and the conduction electron polarization. We conclude with a novel proposal to enhance T c without sacrificing polarization.

Original languageEnglish (US)
Article number257201
JournalPhysical Review Letters
Volume107
Issue number25
DOIs
StatePublished - Dec 13 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Erten, O., Meetei, O. N., Mukherjee, A., Randeria, M., Trivedi, N., & Woodward, P. (2011). Theory of half-metallic ferrimagnetism in double perovskites. Physical Review Letters, 107(25), [257201]. https://doi.org/10.1103/PhysRevLett.107.257201