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Type: Artigo de periódico
Title: First principles study of the ferromagnetism in Ga1-xMnxAs semiconductors
Author: da Silva, AJR
Fazzio, A
dos Santos, RR
Oliveira, LE
Abstract: We have performed ab initio calculations within the density-functional theory for Ga1-xMnxAs diluted semiconductors. Total energy results unambiguously show that a quasi-localized hole, with predominant p-like character, surrounds the fully polarized Mn up arrow d(5)-electrons. The calculations indicate that the holes form a relatively dispersionless impurity band, thus rendering effective-mass descriptions of hole states open to challenge. We obtain estimates both for the s = 1/2 hole and S = 5/2 Mn exchange coupling, and for the distance dependence of the effective Mn-Mn exchange interaction. The results demonstrate that the effective Mn-Mn coupling is always ferromagnetic, and thus non-RKKY, and is intermediated by the antiferromagnetic coupling of each Mn spin to the holes.
Country: Inglaterra
Editor: Iop Publishing Ltd
Citation: Journal Of Physics-condensed Matter. Iop Publishing Ltd, v. 16, n. 46, n. 8243, n. 8250, 2004.
Rights: fechado
Identifier DOI: 10.1088/0953-8954/16/46/011
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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