Ab initio study of Curie temperatures of diluted magnetic semiconductors

被引：25

作者：

Kudrnovsky, J

Turek, I

Drchal, V

Máca, F

Masek, J

Weinberger, P

Bruno, P

机构：

[1] Acad Sci Czech Republ, Inst Phys, CZ-18221 Prague, Czech Republic

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

[3] AS CR, Inst Phys Mat, CZ-61662 Brno, Czech Republic

[4] Charles Univ Prague, Dept Elect Struct, CZ-12116 Prague, Czech Republic

[5] Vienna Univ Technol, Ctr Computat Mat Sci, A-1060 Vienna, Austria

来源：

JOURNAL OF SUPERCONDUCTIVITY | 2003年 / 16卷 / 01期

关键词：

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

D O I：

10.1023/A:1023257306608

中图分类号：

O59 [应用物理学];

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.

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收藏

页码：119 / 122

页数：4

相关论文

共 13 条

[1] LOCAL MOMENT DISORDER IN FERROMAGNETIC-ALLOYS [J].

AKAI, H ;

DEDERICHS, PH .

PHYSICAL REVIEW B, 1993, 47 (14) :8739-8747

[2] Ferromagnetism and its stability in the diluted magnetic semiconductor (In,Mn)As [J].

Akai, H .

PHYSICAL REVIEW LETTERS, 1998, 81 (14) :3002-3005

[3] Interlayer exchange coupling: The effect of substitutional disorder [J].

Bruno, P ;

Kudrnovsky, J ;

Drchal, V ;

Turek, I .

PHYSICAL REVIEW LETTERS, 1996, 76 (22) :4254-4257

[4] Zener model description of ferromagnetism in zinc-blende magnetic semiconductors [J].

Dietl, T ;

Ohno, H ;

Matsukura, F ;

Cibert, J ;

Ferrand, D .

SCIENCE, 2000, 287 (5455) :1019-1022

[5] A 1ST-PRINCIPLES THEORY OF FERROMAGNETIC PHASE-TRANSITIONS IN METALS [J].

GYORFFY, BL ;

PINDOR, AJ ;

STAUNTON, J ;

STOCKS, GM ;

WINTER, H .

JOURNAL OF PHYSICS F-METAL PHYSICS, 1985, 15 (06) :1337-1386

[6] Defect-induced magnetic structure in (Ga1-xMnx)As -: art. no. 187202 [J].

Korzhavyi, PA ;

Abrikosov, IA ;

Smirnova, EA ;

Bergqvist, L ;

Mohn, P ;

Mathieu, R ;

Svedlindh, P ;

Sadowski, J ;

Isaev, EI ;

Vekilov, YK ;

Eriksson, O .

PHYSICAL REVIEW LETTERS, 2002, 88 (18) :1872021-1872024

[7] LOCAL SPIN-DENSITY FUNCTIONAL-APPROACH TO THE THEORY OF EXCHANGE INTERACTIONS IN FERROMAGNETIC METALS AND ALLOYS [J].

LIECHTENSTEIN, AI ;

KATSNELSON, MI ;

ANTROPOV, VP ;

GUBANOV, VA .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1987, 67 (01) :65-74

[8] Properties of ferromagnetic III-V semiconductors [J].

Ohno, H .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 200 (1-3) :110-129

[9] Ab initio calculations of exchange interactions, spin-wave stiffness constants, and Curie temperatures of Fe, Co, and Ni -: art. no. 174402 [J].

Pajda, M ;

Kudrnovsky, J ;

Turek, I ;

Drchal, V ;

Bruno, P .

PHYSICAL REVIEW B, 2001, 64 (17)

[10] Oscillatory Curie temperature of two-dimensional ferromagnets [J].

Pajda, M ;

Kudrnovsky, J ;

Turek, I ;

Drchal, V ;

Bruno, P .

PHYSICAL REVIEW LETTERS, 2000, 85 (25) :5424-5427