We show that the resistivity rho(T) of disordered ferromagnets near, and above, the Curie temperature T_c generically exhibits a stronger anomaly than the scaling-based Fisher-Langer prediction. Treating transport beyond the Boltzmann description, we find that within mean-field theory, d\rho/dT exhibits a |T-T_c|^{-1/2} singularity near T_c. Our results, being solely due to impurities, are relevant to ferromagnets with low T_c, such as SrRuO3 or diluted magnetic semiconductors, whose mobility near T_c is limited by disorder.
Cite
@article{arxiv.cond-mat/0408602,
title = {Disorder-Induced Resistive Anomaly Near Ferromagnetic Phase Transitions},
author = {Carsten Timm and M. E. Raikh and Felix von Oppen},
journal= {arXiv preprint arXiv:cond-mat/0408602},
year = {2009}
}
Comments
5 pages, 3 figures; V2: with a few clarifications, as published