Spin-polaron model: transport properties of EuB$_6$

Details Spin-polaron model: transport properties of EuB$_6$ Spin-polaron model: transport properties of EuB$_6$

2004-02-25

arxiv.org/abs/cond-mat/0402608v1

PRB, 69 134423 (2004), see also publisher's note: PRB 70 029903 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.134423

To understand anomalous transport properties of EuB$_6$, we have studied the spin-polaron Hamiltonian incorporating the electron-phonon interaction. Assuming a strong exchange interaction between the carriers and the localized spins, the electrical conductivity is calculated. The temperature and magnetic field dependence of the resistivity of EuB$_6$ are well explained. At low temperature, magnons dominate the conduction process, whereas the lattice contribution becomes significant at very high temperature due to the scattering with the phonons. Large negative magnetoresistance near the ferromagnetic transition is also reproduced as observed in EuB$_6$.

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