Chromium-based diluted magnetic semiconductors.
Chromium-based diluted magnetic semiconductors.
复制标题
铬基稀磁半导体。
DOI：
10.1103/physrevb.49.13987
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发表时间：
1994
影响因子：
3.7
通讯作者：
Bhattacharjee Ak
中科院分区：
文献类型：
--
作者：
Bhattacharjee Ak
在包含轨道耦合项的杂化诱导空穴-离子相互作用的有效哈密顿量下，研究了立方铬基稀磁半导体价带的塞曼分裂。静态的Jahn-Teller扭曲倾向于抑制轨道贡献。子带有序性与近藤类自旋交换模型相同，但总体分裂减少。我们还计算了磁化强度。与最近发表的Zn1−xCrxSe的磁反射和磁化强度数据进行了比较，结果表明符合得很好。解释了有效p-d交换的反常符号(铁磁性)。
The Zeeman splitting of the valence band of a cubic Cr-based diluted magnetic semiconductor is studied within an effective Hamiltonian for the hybridization-induced hole-ion interaction that includes orbital coupling terms. The static Jahn-Teller distortion tends to quench the orbital contribution. The subband ordering is the same as in the Kondo-like spin-exchange model, but the overall splitting is reduced. We also compute the magnetization. Comparison with recently published magnetoreflectance and magnetization data in Zn 1− x Cr x Se shows excellent agreement. The anomalous sign (ferromagnetic) of the effective p-d exchange is explained.