Theory of ferromagnetic semiconductors

Physica Status Solidi (A) Applications and Materials Science - Tập 204 Số 1 - Trang 15-32 - 2007
Hiroshi Katayama‐Yoshida1, Kazunori Satō1, Tetsuya Fukushima1, Masayuki Toyoda1, Hidetoshi Kizaki1, Van An Dinh1, R. Zeller2
1Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
2Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany

Tóm tắt

Abstract

Based upon ab initio electronic structure calculations by the Korringa–Kohn–Rostoker coherent‐potential approximation (KKR‐CPA) method within the local‐density approximation (LDA), we propose a unified physical picture of magnetism and an accurate calculation method of Curie temperature (T C) in dilute magnetic semiconductors (DMSs) in II–VI and III–V compound semiconductors. We also propose the unified physical picture of magnetism in the DMS, where ferromagnetic Zener's double‐exchange mechanism (or Zener's p–d exchange mechanism) caused by the partially occupied impurity band and anti‐ferromagnetic super‐exchange mechanism (or ferromagnetic super‐exchange mechanism) is competing to determine the magnetic states in the DMS. We propose that the three‐dimensional 3D Dairiseki‐phase and one‐dimensional 1D Konbu‐phase caused by spinodal nano‐decomposition are responsible for high‐T C phase in the inhomogeneous system. We propose the new methodology to go beyond LDA to describe the highly correlated electron system by taking into account the self‐interaction correction (SIC) to the LDA. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Physica Status Solidi (A) Applications and Materials Science

Tập 204 Số 1

15-32

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