Relation of Curie temperature and conductivity: (Ga,Mn)As alloy as a case study

Details Relation of Curie temperature and conductivity: (Ga,Mn)As alloy as a case study Relation of Curie temperature and conductivity: (Ga,Mn)As alloy as a case study

2007-08-29

arxiv.org/abs/0708.3921v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

The manuscript is accepted for publication in APL

Scientific paper

10.1063/1.2778468

Experimental investigations of diluted magnetic semiconductors indicate a strong relation between Curie temperature and conductivity. Both quantities depend non trivially on the concentration of magnetic impurities, the carrier density, and the presence of compensating defects. We calculate both Curie temperature and conductivity of (Ga,Mn)As alloys in a selfconsistent manner based on the same first principles Hamiltonian in which the presence of compensating defects is taken into account. The effect of As-antisites and Mn-interstitials is determined separately and a good agreement between theory and experiment exists only in the case where the dominating mechanism of is due to the Mn-interstitials.

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