Title

Dynamical cluster approximation in disordered systems with magnetic impurities

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Journal of the Physical Society of Japan

Volume

73

Issue

12

First Page

3448

Last Page

3452

Publication Date

12-1-2004

Abstract

We present a theoretical method to study diluted magnetic semiconductors, beyond the single-site approximation, extending the dynamical cluster approximation (DCA). By the method, we can consider the nonlocal correlations due to disorder and discuss effects of the direct exchange interaction between magnetic impurities on the properties of the itinerant carriers. We apply the method to a three-dimensional cubic lattice system with random localized spins. We show that the strong antiferromagnetic superexchange interaction between nearest-neighbor sites suppresses the polarization of the carrier spins. ©2004 The Physical Society of Japan.

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Digitial Object Identifier (DOI)

10.1143/JPSJ.73.3448

Disciplines

Physics

Keywords

Ferromagnetism; Diluted magnetic semiconductors

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