Exchange interactions and Curie temperature in (Ga,Mn)As

被引：96

作者：

Sandratskii, LM ^{[1
]}

Bruno, P ^{[1
]}

机构：

[1] Max Planck Inst Mikrostrukturphys, D-06120 Halle An Der Saale, Germany

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.66.134435

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use supercell and frozen-magnon approaches to study the dependence of the magnetic interactions in (Ga,Mn)As on the Mn concentration. We report the parameters of the exchange interaction between Mn spins and the estimates of the Curie temperature within the mean-field and random-phase approximations. In agreement with experiment we obtain a nonmonotonous dependence of the Curie temperature on the Mn concentration. We estimate the dependence of the Curie temperature on the concentration of the carries in the system and show that the decrease of the number of holes in the valence band leads to a fast decrease of the Curie temperature. We show that the hole states of the valence band are more efficient in mediating the exchange interaction between Mn spins than the electron states of the conduction band.

引用

页码：1344351 / 1344357

页数：7

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