Curie point singularity in the temperature derivative of resistivity in (Ga,Mn)As

Details Curie point singularity in the temperature derivative of resistivity in (Ga,Mn)As Curie point singularity in the temperature derivative of resistivity in (Ga,Mn)As

2008-04-09

arxiv.org/abs/0804.1578v2

Phys.Rev.Letters 101, 077201 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.077201

We observe a singularity in the temperature derivative $d\rho/dT$ of resistivity at the Curie point of high-quality (Ga,Mn)As ferromagnetic semiconductors with $T_c$'s ranging from approximately 80 to 185 K. The character of the anomaly is sharply distinct from the critical contribution to transport in conventional dense-moment magnetic semiconductors and is reminiscent of the $d\rho/dT$ singularity in transition metal ferromagnets. Within the critical region accessible in our experiments, the temperature dependence on the ferromagnetic side can be explained by dominant scattering from uncorrelated spin fluctuations. The singular behavior of $d\rho/dT$ on the paramagnetic side points to the important role of short-range correlated spin fluctuations.

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