Disorder and ferromagnetism in diluted magnetic semiconductors

Sung Ryul Yang, A. H. MacDonald

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have investigated the interplay between disorder and ferromagnetism in (formula presented) semiconductors. Our study is based on a model in which (formula presented) Mn local moments are exchange coupled to valence-band holes that interact via Coulomb interactions with each other, with ionized Mn acceptors, and with the antisite defects present in these materials. We find quasiparticle participation ratios consistent with a metal-insulator transition that occurs in the ferromagnetic state near (formula presented) By evaluating the distribution of exchange mean fields at Mn moment sites, we provide evidence in favor of the applicability of impurity-band magnetic-polaron and hole-fluid models on insulating and metallic sides of the phase transition, respectively.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number15
DOIs
Publication statusPublished - 2003 Apr 2

Fingerprint

Ferromagnetism
ferromagnetism
disorders
Gene Conversion
Metal insulator transition
Valence bands
Coulomb interactions
moments
antisite defects
Phase transitions
Impurities
Semiconductor materials
Defects
Fluids
insulators
valence
impurities
fluids
metals
Diluted magnetic semiconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Disorder and ferromagnetism in diluted magnetic semiconductors. / Yang, Sung Ryul; MacDonald, A. H.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 67, No. 15, 02.04.2003.

Research output: Contribution to journalArticle

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AB - We have investigated the interplay between disorder and ferromagnetism in (formula presented) semiconductors. Our study is based on a model in which (formula presented) Mn local moments are exchange coupled to valence-band holes that interact via Coulomb interactions with each other, with ionized Mn acceptors, and with the antisite defects present in these materials. We find quasiparticle participation ratios consistent with a metal-insulator transition that occurs in the ferromagnetic state near (formula presented) By evaluating the distribution of exchange mean fields at Mn moment sites, we provide evidence in favor of the applicability of impurity-band magnetic-polaron and hole-fluid models on insulating and metallic sides of the phase transition, respectively.

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