Spin Wave Spectrum of a Disordered Double-Exchange Model(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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A double-exchange model with quenched disorder for conduction electrons is studied by field theoretical methods. Using a path integral formalism and replica techniques based on it, an ensemble-averaged spin wave dispersion of localized spins is derived. It is shown that the spectrum of the spin wave has gaps at the multiple of the Fermi wave number of the conduction electrons in the presence of disorder, and hence, quenched disorder for electrons adds a striking effect to the dynamics of localized spins. In the strong disorder limit, the present results suggest a spin-glass-like behavior due to the frustration of the exchange coupling.
- 社団法人日本物理学会の論文
- 2004-07-15
著者
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Fukui Takahiro
Department of Cardiology
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Fukui T
Department Of Mathematical Sciences Ibaraki University
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