Comparison of Exchange Interactions in II-VI, III-V, and I-II-V Dilute Magnetic Semiconductors: Density Functional Approach

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

Abstracts

EN

We use the coherent potential method based on the density-functional theory to compare the electronic structures and magnetic characteristics of mixed crystals (Ga,Mn)As, (Zn,Mn)Se, and Li(Zn,Mn)As. We show that, with the same degree of doping, the magnetic behavior of these materials is very similar, reflecting the similarity of their electronic structures. In particular, the superexchange in (Ga,Mn)As is as strong as in (Zn,Mn)Se and the ferromagnetic coupling in all these dilute magnetic semiconductors becomes dominant only at sufficient concentration of the holes. Remarkably, we find that ferromagnetic state appears not only in p-type, but also in n-type materials at a comparable level of doping. Although obtaining strongly n-type doped III-V dilute magnetic semiconductors is improbable, Li(Zn,Mn)As seems to be a promising candidate for a ferromagnetic n-type semiconductor.

Keywords

EN

71.15.Ap; 71.20.Nr; 71.55.Eq; 75.50.Pp

Discipline

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

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 110
• Issue: 2
• Pages: 249-254

Dates

published

2006-08

received

2006-06-17

Contributors

author

J. Mašek

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

author

J. Kudrnovský

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

author

F. Máca

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

author

T. Jungwirth

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

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Identifiers

DOI

10.12693/APhysPolA.110.249