Incoherent Charge Dynamics in Perovskite Manganese Oxides : Condensed Matter: Electronic Properties, etc.
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概要
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A minimal model is proposed for the perovskite manganese oxides showing strongly incoherent charge dynamics with a suppressed Drude weight in the ferromagnetic and metallic phase near the insulator. We investigate a generalized double-exchange model which includes three elements; the orbital degeneracy of e_g conduction bands, the Coulomb interaction and fluctuating Jahn-Teller distortions. We demonstrate that Lanczos diagonalization calculations combined with Monte Carlo sampling of the largely fluctuating lattice distortions result in the optical conductivity which quantitatively accounts for the experimental indications. It is found that all three elements are indispensable for understanding the charge dynamics in these compounds.
- 社団法人日本物理学会の論文
- 2000-05-15
著者
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坂本 博康
Graduate School Of Material Science University Of Hyogo
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Inoue Masataka
Osaka Dental Univ. Osaka Jpn
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MOTOME Yukitoshi
RIKEN (The Institute of Physical and Chemical Research)
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Inoue M
Department Of Physics Kagoshima University
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Imada Masatoshi
Institute For Solid State Physics University Of Tokyo
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Yukitoshi Motome
Riken (the Institute Of Physical And Chemical Research)
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Motome Yukitoshi
Department Of Applied Physics University Of Tokyo
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Motome Yukitoshi
Institute Of Materials Science University Of Tsukuba
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Nakano Hiroki
Department Of Immunology And Medical Zoology Hyogo College Of Medicine
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Nakano Hiroki
Institute For Solid Physics University Of Tokyo
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Imada Masatoshi
Institute For Solid State Physics The University Of Tokyo
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