Temperature dependence of magnetism near defects in SrB_6

Abstract

The T-dependence of magnetic moments in SrB_6 is studied through spin-polarized band calculations for a supercell of Sr_{27}B_{156} containing a B_6 vacancy. The magnetic moment decays rather quickly with T despite the fact that only electronic Fermi-Dirac effects are included. This result and the T-dependence of moments near a La impurity can hardly explain the reports of a very high Curie temperature in hexaborides, but suggest that the magnetism is caused by some other type of impurity.

arXiv comment3 pages, 2 figures

References in corpus (8)

• Zero Temperature Phases of the Electron Gas
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• CaB_6: a new semiconducting material for spin electronics
• Point defects, ferromagnetism and transport in calcium hexaboride
• Ferromagnetism and superstructure in Ca_{1-x}La_xB_6
• Electronic structure and properties of pure and doped $\epsilon$-FeSi from ab-initio local density theory
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Cited by in corpus (2)

• High-temperature ferromagnetism of $sp$ electrons in narrow impurity bands: Application to CaB${}_6$
• Electronic structure and magnetism in X_xW_{1-x}O_3 (X=Nb,V,Re) from supercell calculations