Electronic States in the Cu-Oxide Superconductors
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概要
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The d-p model with the local constraint has been studied. With help of the slave boson and 1/N-expansion the electronic states are investigated. At T<T_0 (coherence temperature) a new band (mid-gap state) appears in the CT gap which behaves as the Fermi liquid with the large Fermi surface. Luttinger sum rule is proved. At T_0 Isim T Isim ω_0 (resonance temperature) the mid-gap state behaves as the marginal Fermi liquid. At T gsim ω_0 such renormalized band collapses. These occur as the crossover phenomena in contrast to the phase transition in the mean field approximation. The anomalous physical properties are observed in the temperature region of the marginal Fermi liquid. The system is metallic or insulating at non-doping limit when Δ^^-=Δ/2t_<pd><2.37 or Δ^^->2.37. For Δ^^-=2.37, the charge susceptibility becomes zero, which is a characteristic feature of the strongly correlated system. U_<pd> changes the critical value of Δ^^-, enhances the charge fluctuation and causes the phase separation. The interactions mediated by the enhanced charge fluctuation may derive the superconductivity of the cuprate compounds.
- 理論物理学刊行会の論文
- 1992-02-25
著者
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Kuroda Yoshihiro
Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo Universi
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ONO Yoshiaki
Department of Physics,Nagoya University
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MATSUURA Tamifusa
Department of Physics,Nagoya University
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Tamifusa Matsuura
Department Of Physics Nagoya University
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Matsuura Tamifusa
Department Of Physics Nagoya University
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Miura K
Department Of Mechanical Systems Faculty Of Computer Science And Systems Engineerig Kyushu Institute
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Miura Kazuo
Department Of Agricultural Chemistry College Of Agriculture University Of Osaka Prefecture
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Kosuge Yu
Department Of Physics Nagoya University
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Kuroda Yoshihiro
Department Of Pharmaceutical Health Care Faculty Of Pharmaceutical Sciences Himeji Dokkyo University
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Yoshiaki Ono
Department Of Physics Nagoya University
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Ono Yoshiaki
Department Of Geriatric Dentistry Osaka Dental University
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HIRASHIMA Dai
Department of Physics, Nagoya University
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Hirashima Dai
Department Of Physics Nagoya University
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Ono Yoshiaki
Department of Physics, Nagoya University
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Hirashima Dai
Department of Material Science, International Christian University, Mitaka, Tokyo 181-8585, Japan
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