Commensurate-Incommensurate Phase Transition in Quasi One-Dimensional Electron-Phonon System : Nearly Half-Filled Band
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概要
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Within a mean-field approximation for phonon fields one soliton formation energy F_<sol> is calculated at finite temperatures in the limit of weak coupling for the quasi one-dimensional electron-phonon system with a nearly half-filled band. The phase diagram on the (μ, T) plane is given on the assumption that the commensurate-incommensurate transition is of second order. Here μ is the Fermi energy as measured from the middle of a conduction band. For the system without an electron reservoir there are two successive phase transitions at proper values of μ, from the normal (N) to the commensurate (C) phase and the commensurate to the incommensurate (IC) phase as T is decreased to zero. For the case of finite reservoir there exists the region of the C-phase at T=0, since the electron reservoir suppresses the increase of the chemical potential. For the case of infinite reservoir the chemical potential does not change with T and the phase transition occurs from the IC-to the C-phase as T is lowered to zero. Near the triple point analytical calculations are made to obtain the slope of the T_<CI> (C-IC transition temperature) line. The C-phase becomes more stable and occupies a larger region on the (μ,T) plane as the size of electron reservoir increases.
- 理論物理学刊行会の論文
- 1981-09-25
著者
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Yamamoto Hikaru
Depart Of Physics Kyoto University
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Ohmi Tetsuo
Depart Of Physics Kyoto University
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Yamamoto Hikaru
Department Of Physics Kyoto University
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YAMAMOTO Hisashi
Research Institute for Theoretical Physics Hiroshima University
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Yamamoto H
Department Of Management Engineering Faculty Of Science And Technology Teikyo University Of Science
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YAMAMOTO Hiroaki
Department of Physics, University of Tokyo
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OHMI Tetsuo
Dapartment of Physics, Kyoto University
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YAMAMOTO Hikaru
Depart of Physics, Kyoto University
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