Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/69587
Type: Artigo de periódico
Title: Hole concentration in a diluted ferromagnetic semiconductor
Author: dos Santos, RR
Oliveira, LE
Castro, JDE
Abstract: We consider a mean-field approach to the hole-mediated ferromagnetism in III-V Mn-based semiconductor compounds in order to discuss the dependence of the hole density on that of Mn sites in Ga1-xMnxAs. The hole concentration, p, as a function of the fraction of Mn sites, x, is parametrized in terms of the product m*J(pd)(2) (where m* is the hole effective mass and J(pd) is the Kondo like hole/local-moment coupling), and the critical temperature T-c. By using experimental data for these quantities, we have established the dependence of the hole concentration on x, which can be associated with the occurrence of a re-entrant metal-insulator transition taking place in the hole gas. We also calculated the dependence of the Mn magnetization on x, for different temperatures (T), and found that as T increases, the width of the composition-dependent magnetization decreases dramatically, and that the magnetization maxima also decrease in magnitude, indicating the need for quality control of the Mn doping level in diluted magnetic semiconductor devices.
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: fechado
Date Issue: 2002
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

Files in This Item:
File Description SizeFormat 
WOS000175432200011.pdf110.3 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.