Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.42: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Curie point singularity in (Ga,Mn)As — •Vit Novak, Kamil Olejnik, Miroslav Cukr, Petr Vasek, Zbynek Soban, and Tomas Jungwirth — Institute of Physics AS CR, Cukrovarnicka 10, 162 53 Prague, Czech Republic

A striking cusp-like singularity has been found in the temperature derivative of resistivity at the Curie point of high-quality (Ga,Mn)As ferromagnetic semiconductors [1]. 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 singularity in transition metal ferromagnets. Applicability of the singularity to accurately determine the Curie temperature is demonstrated and compared to standard magnetometry and Arrott plot technique.

[1] V. Novak et al., Phys. Rev. Letters 101, 077201 (2008).