To understand anomalous transport properties of EuB6, 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 EuB6 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 EuB6.
@article{arxiv.cond-mat/0402608,
title = {Spin-polaron model: transport properties of EuB$_6$},
author = {Jayita Chatterjee and Unjong Yu and B. I. Min},
journal= {arXiv preprint arXiv:cond-mat/0402608},
year = {2009}
}