Disorder-Induced Resistive Anomaly Near Ferromagnetic Phase Transitions

Details Disorder-Induced Resistive Anomaly Near Ferromagnetic Phase Transitions Disorder-Induced Resistive Anomaly Near Ferromagnetic Phase Transitions

2004-08-27

arxiv.org/abs/cond-mat/0408602v2

Phys. Rev. Lett. 94, 036602 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures; V2: with a few clarifications, as published

Scientific paper

10.1103/PhysRevLett.94.036602

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.

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