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题名: Mean-field study of Fe2+- and Co2+-doped diluted magnetic semiconductors
作者: Zheng YH;  Xia JB
发表日期: 2005
摘要: Based on a modified mean-field model, we calculate the Curie temperatures of Fe2+- and Co2+-doped diluted magnetic semiconductors (DMSs) and their dependence on the hole concentration. We find that the Curie temperatures increase with an increase in hole concentration and the relationship T(C)proportional to p(1/3) also approximately holds for Fe2+- and Co2+-doped systems with moderate hole concentration. For either low or high hole concentrations, however, the p(1/3) law is violated due to the anomalous magnetization of the Fe2+ and Co2+ ions, and the nonparabolic nature of the hole bands. Further, the values of T-C for Fe2+- and Co2+-doped DMSs are significantly higher than those for Mn2+-doped DMSs, due to the larger exchange interaction strength.
刊名: PHYSICAL REVIEW B
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Zheng, YH; Xia, JB .Mean-field study of Fe2+- and Co2+-doped diluted magnetic semiconductors ,PHYSICAL REVIEW B,NOV 2005,72 (19):Art.No.195204
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