New class of High-TC diluted ferromagnetic semiconductors based on CaO without transition metal elements

We propose new-type ferromagnetic semiconductors based on CaO and K2S without any transition metal elements. These materials show transparent and half-metallic ferromagnetism if the deep-impurity-band width (W) induced by doping of C, N, Si, or Ge impurities, and the electron-correlation energy (U)...

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Bibliographic Details
Published in:Journal of superconductivity 2005-02, Vol.18 (1), p.37-40
Main Authors: KEMMOCHI, Kazuhide, SEIKE, Masayoshi, SATO, Kazunori, YANASE, Akira, KATAYAMA-YOSHIDA, Hiroshi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetic semiconductors
Physics
Studies of specific magnetic materials
Superconductivity
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Summary:We propose new-type ferromagnetic semiconductors based on CaO and K2S without any transition metal elements. These materials show transparent and half-metallic ferromagnetism if the deep-impurity-band width (W) induced by doping of C, N, Si, or Ge impurities, and the electron-correlation energy (U) satisfy the Stoners condition of highly correlated electron system (U > W). Based on our first-principles calculations, we demonstrate that these materials satisfy the Stoners condition, and could be new candidates for transparent and half-metallic DMSs.
ISSN:0896-1107
1572-9605
DOI:10.1007/s10948-005-2147-7