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| <p><strong>Disorder-Induced Resistive Anomaly Near Ferromagnetic Phase Transitions*</strong></p> | |
| <p><em>Felix von Oppen</em></p> | |
| <p><em>Freie Universitat Berlin</em></p> | |
| <p>We show that the resistivity <em>ρ</em><em>(T)</em> of disordered ferromagnets near, and above, the Curie temperature Tc 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, <em>d</em><em>ρ</em><em>/dT</em> exhibits a |<em>T-T</em><em>c</em>|-1/2 singularity near <em>T</em><em>c</em>. Our results, being solely due to impurities, are relevant to ferromagnets with low <em>T</em><em>c</em>, such as SrRuO3 or diluted magnetic semiconductors, whose mobility near <em>T</em><em>c</em> is limited by disorder.</p> | |
| <p>*Carsten Timm, M. E. Raikh, Felix von Oppen, Phys. Rev. Lett. <strong>94</strong>, 036602 (2005).</p> | |
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