Spectral Function Analysis on Spin Dynamics in Double-Exchange Systems with Randomness

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概要

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• Spin excitation spectrum is studied in the double-exchange model with randomness. Applying the spinwave approximation and the spectral function analysis, we examine excitation energy and linewidthusing analytical as well as numerical methods. For a small wave number q 〜 0, the excitation energy is cosine-like and the linewidth shows q-linear behavior. This indicates thai the spin excitation becomes incoherent or localized near q = 0. Crossover takes place to the marginally coherent regime where both the excitation energy and the linewidth are proportional to q^2. The incoherence is due to localfluctuations of the kinetic energy of electrons. Comparison with experimental results in colossal magnetoresistance manganites suggests that spatially-correlated or mesoscopic-scale fluctuations aremore important in real compounds than local or atomic-scale ones.

• 社団法人日本物理学会の論文
• 2003-03-15

著者

• Motome Yukitoshi

  Tokura Spin Superdtructure Project (sss). Erato Japan Ccience And Technology Corporation (jst) C

• Furukawa Nobuo

  O National Institute Of Advanced Industrial Science And Technology (aist)

• Furukawa Nobuo

  O National Institute Of Advanced Industrial Science And Technology

関連論文

• Anomaly in Spin Excitation Spectrum of Double-Exchange Systems with Randomness
• Spectral Function Analysis on Spin Dynamics in Double-Exchange Systems with Randomness
• Spectral Function Analysis on Spin Dynamics in Double-Exchange Systems with Randomness

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