Design of Transparent, Half-Metallic Ferromagnetic $4d$-Transition-Metal-Doped K2S with High Curie Temperature
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概要
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Curie temperatures are evaluated using first principles in (K,Zr)2S and (K,Nb)2S diluted magnetic semiconductors which have been designed as half-metallic and transparent materials with a large magnetoptical effect. From the total energy differences between the ferromagnetic state and the spin-glass state, estimations of Curie temperatures are achieved by mapping to the Heisenberg model within the mean-field approximation. According to the results, it is possible to fabricate transparent, half-metallic and room-temperature ferromagnets with Zr- and Nb-concentrations of around 5 at%. Effects of additional carrier doping for (K,Mo)2S are also evaluated and it is found that (K,Mo)2S with hole doping (${\sim}5$ at%) exhibits transparency, is half-metallic and has room-temperature ferromagnetism.
- 2004-06-15
著者
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SATO Kazunori
The Institute of Scientific and Industrial Research (ISIR), Osaka University
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Seike Masayoshi
The Institute Of Scientific And Industrial Research Osaka University
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Katayama-yoshida Hiroshi
The Institute Of Scientific And Industrial Research (isir) Osaka University
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Yanase Akira
The Institute Of Scientific And Industrial Research Osaka University
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Sato Kazunori
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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