Low-temperature ferromagnetic properties of the diluted magnetic semiconductorSb2−xCrxTe3

Abstract

We report on magnetic and electrical transport properties of Sb 2-x Cr x Te 3 single crystals with 0 ≤ x ≤ 0.095 over temperatures from 2 K to 300 K. A ferromagnetic state develops in these crystals at low temperatures with Curie temperatures that are proportional to x (for x > 0.014), attaining a maximum value of 20 K for x = 0.095. Hysteresis below T C for applied field parallel to the c-axis is observed in both magnetization and Hall effect measurements. Magnetic as well as transport data indicate that Cr takes the 3+ (3d 3 ) valence state, substituting for antimony in the host lattice structure, and does not significantly affect the background hole concentration. Analysis of the anomalous Hall effect reveals that skew scattering is responsible for its presence. These results broaden the scope of ferromagnetism in the V 2 -VI 3 diluted magnetic semiconductors (DMS) and in ferromagnetic DMS structures generally.

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