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Article Dans Une Revue Journal of Superconductivity and Novel Magnetism Année : 2007

The non-metal-to-metal and Vice-Versa transitions in a GaMnAs layer

E. Dias Cabral
  • Fonction : Auteur
I. C. da Cunha Lima
  • Fonction : Auteur
M. A. Boselli
  • Fonction : Auteur
A. T. da Cunha Lima
  • Fonction : Auteur

Résumé

A self-consistent calculation of the density of states and the spectral density function is performed in a two-dimensional spin-polarized hole system based on a multiple-scattering approximation. Using parameters corresponding to GaMnAs thin layers, a wide range of Mn concentrations and hole densities have been explored to understand the nature, localized or extended, of the spin-polarized holes at the Fermi level for several values of the average magnetization of the Mn system. If the impurity concentration is below a certain threshold, the increase of the magnetization does not lead to a significant change in the localized character of the spin-polarized states. Above this threshold, we reach conditions allowing the occurrence of spin-polarized extended states at the Fermi level-more properly extended states in a very dirty metal-which are very sensitive to the average magnetization. The occurrence of a metal-to-non-metal transition has been surveyed around an optimum combination of the Mn concentration and the free carriers density.

Dates et versions

hal-01293290 , version 1 (24-03-2016)

Identifiants

Citer

E. Dias Cabral, I. C. da Cunha Lima, M. A. Boselli, A. T. da Cunha Lima, A. Ghazali. The non-metal-to-metal and Vice-Versa transitions in a GaMnAs layer. Journal of Superconductivity and Novel Magnetism, 2007, 20 (6), pp.421-427. ⟨10.1007/s10948-007-0241-8⟩. ⟨hal-01293290⟩
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