期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.257201
关键词
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资金
- Center for Emergent Materials
- NSF MRSEC [DMR-0820414]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820414] Funding Source: National Science Foundation
Double perovskites such as Sr2FeMoO6 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.
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