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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.|
Dos Santos R.R.
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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