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Theory of ferromagnetic semiconductors
Author(s) -
KatayamaYoshida H.,
Sato K.,
Fukushima T.,
Toyoda M.,
Kizaki H.,
Dinh V. A.,
Dederichs P. H.
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200673021
Subject(s) - ferromagnetism , condensed matter physics , curie temperature , magnetism , zener diode , spinodal decomposition , magnetic semiconductor , local density approximation , coherent potential approximation , ab initio , exchange interaction , semiconductor , chemistry , phase (matter) , ab initio quantum chemistry methods , electronic structure , physics , quantum mechanics , resistor , voltage , molecule
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)