Double Exchange Model for Magnetic Hexaborides

Details Double Exchange Model for Magnetic Hexaborides Double Exchange Model for Magnetic Hexaborides

2004-02-27

arxiv.org/abs/cond-mat/0402671v1

Phys. Rev. Lett. 93, 147202 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.93.147202

A microscopic theory for rare-earth ferromagnetic hexaborides, such as Eu(1-x)Ca(x)B6, is proposed on the basis of the double-exchange Hamiltonian. In these systems, the reduced carrier concentrations place the Fermi level near the mobility edge, introduced in the spectral density by the disordered spin background. We show that the transport properties such as Hall effect, magnetoresitance, frequency dependent conductivity, and DC resistivity can be quantitatively described within the model. We also make specific predictions for the behavior of the Curie temperature, Tc, as a function of the plasma frequency, omega_p.

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