Electronic properties of EuB6 in the ferromagnetic regime: Half-metal versus semiconductor

Details Electronic properties of EuB6 in the ferromagnetic regime: Half-metal versus semiconductor Electronic properties of EuB6 in the ferromagnetic regime: Half-metal versus semiconductor

2005-11-22

arxiv.org/abs/cond-mat/0511536v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.72.245117

To understand the halfmetallic ferromagnet EuB6 we use the Kondo lattice model for valence and conduction band. By means of a recently developed many-body theory we calculate the electronic properties in the ferromagnetic regime up to the Curie temperature. The decreasing magnetic order induces a transition from halfmetallic to semiconducting behavior along with a band broadening. We show the temperature dependence of the quasiparticle density of states and the quasiparticle dispersion as well as the effective mass, the number of carriers and the plasma frequency which are in good agreement with the experimental data.

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