Critical Temperature of Ferromagnetic Transition in Three-Dimensional Double-Exchange Models : Condensed Matter: Electronic Properties, etc.
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概要
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Ferromagnetic transition in three-dimensional double-exchange models is studied by the Monte Carlo method. Critical temperature T_c is precisely determined by finite-size scaling analysis. Strong spin fluctuations in this itinerant system significantly reduce T_c from mean-fleld estimates. By choosing appropriate parameters, obtained values of T_c quantitatively agree with experiments for the ferromagnetic metal regime of (La,Sr)Mn0_3, which is a typical perovskite manganite showing colossal magnetoresistance. This indicates that the double-exchange mechanism alone is sufficient to explain T_c in this material. Critical exponents are also discussed.
- 社団法人日本物理学会の論文
- 2000-12-15
著者
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FURUKAWA Nobuo
Department of Physics and Mathematics, Aoyama Gakuin University
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Motome Yukitoshi
Institute Of Materials Science University Of Tsukuba
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Motome Yukitoshi
Institute For Solid State Physics University Of Tokyo
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Motome Yukitoshi
Institute Of Materials Science.university Of Tsukuba
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Furukawa Nobuo
Department Of Physics And Mathematics Aoyama Gakuin University:multiferroics Project (mf) Erato Japa
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Furukawa Nobuo
Department Of Physics And Mathematics Aoyama Gakuin University
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Furukawa Nobuo
Department Of Physics Aoyama Gakuin University
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Furukawa N
Department Of Physics And Mathematics Aoyama Gakuin University:multiferroics Project (mf) Erato Japa
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Furukawa Nobuo
Department Of Physics Aoyama Gakkuin University
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