Temperature dependence of magnetism near defects in SrB_6

Details Temperature dependence of magnetism near defects in SrB_6 Temperature dependence of magnetism near defects in SrB_6

2003-05-14

arxiv.org/abs/cond-mat/0305327v1

J.Phys.:Condens. Matter 15, L249, (2003)

Physics

Condensed Matter

Materials Science

3 pages, 2 figures

Scientific paper

10.1088/0953-8984/15/14/104

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.

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