Sr and Mn co-doped LaCuSO: A wide band gap oxide diluted magnetic semiconductor with T_c around 200 K

摘要

Here we report the synthesis of a bulk oxide diluted magnetic semiconductor (DMS) system La_(1-a)Sr_xCu_(0.925)Mn_(0.075)SO (x = 0, 0.025, 0.05, 0.075, and 0.1). As a wide band gap p-type oxide semiconductor, LaCuSO satisfies all the conditions forecasted theoretically to be a room temperature DMS. The Curie temperature (T_c) is around 200 K as x ≥ 0.05, which is among the highest T_c record of known bulk DMS materials up to now. The system provides a rare example of oxide DMS system with p-type conduction, which is important for formation of high temperature spintronic devices.