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Type: Artigo de periódico
Title: First Principles Study Of The Ferromagnetism In Ga1-xmn Xas Semiconductors
Author: Da Silva A.J.R.
Fazzio A.
Dos Santos R.R.
Oliveira L.E.
Abstract: We have performed ab initio calculations within the density-functional theory for Ga1-xMnxAs As diluted semiconductors. Total energy results unambiguously show that a quasi-localized ↓ hole, with predominant p-like character, surrounds the fully polarized Mn ↑ d 5-electrons. The calculations indicate that the holes form a relatively dispersionless impurity band, thus rendering effectivemass 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.
Rights: fechado
Identifier DOI: 10.1088/0953-8984/16/46/011
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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