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

Abstract

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${}_6$.

arXiv comment4 pages, 3 figures, accepted in Phys. Rev. B

References in corpus (3)

• Magnetic Polarons and the Metal-Semiconductor Transition in (Eu,La)B6 and EuO: Raman Scattering Studies
• Magnetotransport in the low carrier density ferromagnet EuB_6
• Fluctuation induced hopping and spin polaron transport

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• Electronic phase separation due to magnetic polaron formation in the semimetallic ferromagnet EuB${}_6$ - A weakly-nonlinear-transport study
• Low temperature magnetic structure and lattice response in SmCuAs${}_2$