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
We observe a singularity in the temperature derivative drho/dT of resistivity at the Curie point of high-quality (Ga,Mn)As ferromagnetic semiconductors with Tc'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 …