RUDERMAN-KITTEL-KASUYA-YOSIDA EXCHANGE INTERACTION IN MANY-VALLEY IV-VI-SEMIMAGNETIC SEMICONDUCTORS

被引：32

作者：

STORY, T ^{[1
]}

EGGENKAMP, PJT ^{[1
]}

SWUSTE, CHW ^{[1
]}

SWAGTEN, HJM ^{[1
]}

DEJONGE, WJM ^{[1
]}

LEMMENS, LF ^{[1
]}

机构：

[1] UNIV ANTWERP, INST APPL MATH, B-2020 ANTWERP, BELGIUM

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.45.1660

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Ruderman-Kittel-Kasuya-Yosida (RKKY) indirect-exchange interaction via free carriers is analyzed in the case of IV-VI semimagnetic semiconductors (diluted magnetic semiconductors). Carriers responsible for the RKKY interaction in these materials originate from the anisotropic band of heavy holes located at the SIGMA-point of the Brillouin zone (i.e., there are 12 equivalent valleys of this band). Both intervalley and intravalley electron processes contribute to the exchange coupling. Calculations of the RKKY exchange integral and the paramagnetic Curie temperature ((H)) are presented. The exchange integral is anisotropic, and its dependence on the interspin distance is significantly modified in such a way that the role of antiferromagnetic couplings is increased. As a consequence, the value of (H) is reduced.

引用

页码：1660 / 1667

页数：8

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