First-order transition between a small-gap semiconductor and a ferromagnetic metal in the isoelectronic alloys FeSi$_{1-x}$Ge$_x$

Details First-order transition between a small-gap semiconductor and a ferromagnetic metal in the isoelectronic alloys FeSi$_{1-x}$Ge$_x$ First-order transition between a small-gap semiconductor and a ferromagnetic metal in the isoelectronic alloys FeSi$_{1-x}$Ge$_x$

2002-02-26

arxiv.org/abs/cond-mat/0202474v1

Physics

Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.89.257203

The contrasting groundstates of isoelectronic and isostructural FeSi and FeGe can be explained within an extended local density approximation scheme (LDA+U) by an appropriate choice of the onsite Coulomb repulsion, $U$ on the Fe-sites. A minimal two-band model with interband interactions allows us to obtain a phase diagram for the alloys FeSi$_{1-x}$Ge$_{x}$. Treating the model in a mean field approximation, gives a first order transition between a small-gap semiconductor and a ferromagnetic metal as a function of magnetic field, temperature, and concentration, $x$. Unusually the transition from metal to insulator is driven by broadening, not narrowing, the bands and it is the metallic state that shows magnetic order.

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