Curie temperature of 3d transition-metal-doped GaAs

摘要

The Zener model of ferromagnetism predicts that higher values of Curie temperature (CT) can be achieved by materials containing greater doping concentrations and hole concentrations. However, the prediction value is significantly higher than those from experiments with high doping concentrations. This discrepancy is resolved by an improved theoretical prediction for CT of 3d transition-metal-doped GaAs. Cr-doping results in higher CT than the Mn-doped GaAs. Maximum CT of Ga _(1-x)Mn _xAs is 215 K with 13.9% doping concentration. Room temperature CT can be achieved by 11.3% Cr-doped GaAs. Maximum CT of Ga _(1-x)Cr _xAs can reach 514.4 K with 31.7% doping concentration.