The semiconductor-to-ferromagnetic-metal transition in FeSb2

Details The semiconductor-to-ferromagnetic-metal transition in FeSb2 The semiconductor-to-ferromagnetic-metal transition in FeSb2

2006-04-02

arxiv.org/abs/cond-mat/0604020v2

Eur. Phys. J. B 53, 205 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1140/epjb/e2006-00361-0

We propose FeSb2 to be a nearly ferromagnetic small gap semiconductor, hence a direct analog of FeSi. We find that despite different compositions and crystal structures, in the local density approximation with on-site Coulomb repulsion correction (LDA+U) method magnetic and semiconducting solutions for U=2.6 eV are energetically degenerate similar to the case of FeSi. For both FeSb2 and FeSi (FeSi1-xGex alloys) the underlying transition mechanism allows one to switch from a small gap semiconductor to a ferromagnetic metal with magnetic moment 1 muB per Fe ion with external magnetic field.

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