Critical Phenomena of Ferromagnetic Transition in Double-Exchange Systems : Condensed Matter: Electronic Properties, etc.
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概要
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Critical phenomena of ferromagnetic transition at finite temperatures are studied in double-exchange systems. In order to investigate strong interplay between charge and spin degrees of freedom, the Monte Carlo technique is applied to include fluctuations in a controlled and unbiased manner. By using finite-size scaling analysis, critical exponents and transition temperature are estimated for a model with Ising spin symmetry in two dimensions. The obtained exponents differ significantly from the mean-field values, but are consistent with those of spin models with short-range exchange interactions. The universality class of this transition belongs to that of short-range interaction with the same spin symmetry. We also discuss the case for three dimensions. The results are compared with experimental results in perovskite manganites which show colossal magnetoresistance.
- 社団法人日本物理学会の論文
- 2001-06-15
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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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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