Interstitial Mn in (Ga,Mn)As: Hybridization with Conduction Band and Electron Mediated Exchange Coupling

• Authors: J. Mašek , J. Kudrnovský , F. Máca , T. Jungwirth
• Languages of publication: EN

Abstracts

EN

We investigate theoretically the possibility of n-type DMS based on III-V materials with Mn impurities in interstitial instead of substitutional positions, and discuss some situations when this can happen. We show that the d-states at interstitial Mn atoms in (Ga,Mn)As hybridize with both valence and conduction bands. The hybridization is strong enough to establish an indirect ferromagnetic coupling of the Mn magnetic moments mediated either by holes or by conduction electrons. Moreover, the Curie temperatures estimated within the mean-field theory are comparable with T_c obtained for conventional materials with the same concentration of Mn_{Ga}.

Keywords

EN

71.15.Ap; 71.20.Nr; 75.50.Pp

Discipline

• 71.15.Ap: Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)
• 75.50.Pp: Magnetic semiconductors
• 71.20.Nr: Semiconductor compounds

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 112
• Issue: 2
• Pages: 215-219

Dates

published

2007-08

received

2007-06-09

Contributors

author

J. Mašek

• Institute of Physics v.v.i., AS CR, Na Slovance 2, 182 21 Prague 8, Czech Republic

author

J. Kudrnovský

• Institute of Physics v.v.i., AS CR, Na Slovance 2, 182 21 Prague 8, Czech Republic

author

F. Máca

• Institute of Physics v.v.i., AS CR, Na Slovance 2, 182 21 Prague 8, Czech Republic

author

T. Jungwirth

• Institute of Physics v.v.i., AS CR, Cukrovarnická 10, 162 53 Prague 6, Czech Republic
• School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK

References

• 1. T. Jungwirth, J. Sinova, J. Masek, J. Kucera, A.H. MacDonald, Rev. Mod. Phys., 78, 809, 2006
• 2. K.M. Yu, W. Walukiewicz, T. Wojtowicz, I. Kuryliczyn, X. Liu, Y. Sasaki, J.K. Furdyna, Phys. Rev. B, 65, 201303, 2002
• 3. F. Máca, J. Masek, Phys. Rev. B, 65, 235209, 2002
• 4. J. Blinowski, P. Kacman, Phys. Rev. B, 67, 121204, 2003
• 5. J. Masek, F. Máca, Phys. Rev. B, 69, 165212, 2004
• 6. J. Masek, J. Kudrnovský, F. Máca, J. Sinova, A.H. MacDonald, R.P. Campion, B.L. Gallagher, T. Jungwirth, Phys. Rev. B, 75, 045202, 2007
• 7. I. Turek, V. Drchal, J. Kudrnovský, M. Sob, P. Weinberger, Electronic Structure of Disordered Alloys, Surfaces and Interfaces, Kluwer, Boston 1997
• 8. D.N. Talwar, C.S. Ting, Phys. Rev. B, 25, 2660, 1982
• 9. W. Harrison, Electronic Structure and the Properties of Solid, Freeman, San Francisco 1980
• 10. J. Masek, J. Kudrnovský, F. Máca, T. Jungwirth, Acta Phys. Pol. A, 110, 249, 2006
• 11. J. Masek, J. Kudrnovský, F. Máca, B.L. Gallagher, R.P. Campion, D.H. Gregory, T. Jungwirth, Phys. Rev. Lett., 98, 067202, 2007

Identifiers

DOI

10.12693/APhysPolA.112.215