Ab Initio Study of Curie Temperatures of Diluted Magnetic Semiconductors

被引：0

作者：

J. Kudrnovský

I. Turek

V. Drchal

F. Máca

J. Mašek

P. Weinberger

P. Bruno

机构：

[1] Institute of Physics AS CR,Department of Electronic structures

[2] Na Slovance 2,Center for Computational Materials Science

[3] Max-Planck Institut für Mikrostrukturphysik,undefined

[4] Weinberg 2,undefined

[5] Institute of Physics of Materials AS CR,undefined

[6] Žižkova 22,undefined

[7] Charles University,undefined

[8] Ke Karlovu 5,undefined

[9] Technical University of Vienna,undefined

[10] Getreidemarkt 9,undefined

[11] Max-Planck Institut für Mikrostrukturphysik,undefined

[12] Weinberg 2,undefined

来源：

Journal of Superconductivity | 2003年 / 16卷

关键词：

Curie temperature; Heisenberg model; diluted magnetic semiconductors; ab initio approach; As antisites;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The Curie temperature of diluted (Ga,Mn)As magnetic semiconductors in the presence of As antisites is studied from first principles. We map total energies associated with rotations of Mn-magnetic moments onto the effective classical Heisenberg Hamiltonian which is treated in the mean-field approximation to find the Curie temperature. The presence of donors strongly reduces the Curie temperature and gives rise to a ground state with a partial disorder of local moments. We show that the observed dependence of the Curie temperature on the Mn concentration indicates that the concentration of As antisites increases with the Mn content.

引用

页码：119 / 122

页数：3

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