Ferromagnetism in a new dilute magnetic semiconductor Sb2−xCrxTe3

Abstract

Magnetic and galvanomagnetic properties of single crystals of a new dilute magnetic semiconductor p -Sb 2− x Cr x Te 3 ( x = 0, 0.0115, 0.0215) are investigated in a temperature range of 1.7–300 K. A ferromagnetic phase with a Curie temperature of T C ≈ 5.8 ( x = 0.0215) and 2.0 K ( x = 0.0115) is detected. The easy magnetization axis is parallel to the C 3 crystallographic axis. Analysis of the Shubnikov-de Haas effect observed in these crystals in strong magnetic fields leads to the conclusion that the hole concentration decreases as a result of doping with Cr. Negative magnetoresistance and the anomalous Hall effect are observed in Cr-doped samples at liquid helium temperature.