Pseudogap Phenomena and Phase Diagram in the Two-Band Hubbard Model : Condensed Matter: Electronic Properties, etc.

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概要

• 論文の詳細を見る

• High-T_c superconducting materials (HTSC) have anomalous properties such as the pseudogap in the Hall coefficient, 1/T_1T and the density of states etc. First, including the effects of strong on-site repulsion between d-electrons at Cu-sites, we obtain quasi-particles with superexchange interaction J_s, whose band-width tends to reach zero, i.e., the system goes to the insulator, as δ tends to reach zero. The quasi-particles correspond to Zhang-Rice singlet states. J_s larger than the band width combined with the two-dimensional characteristic of the system induces strong antiferromagnetic fluctuations (AFF) and superconducting fluctuations (SCF). We treat effects of the AFF in the FLEX approximation and those of the SCF in the self-consistent t-matrix approximation to show that both fluctuations in the underdoped region start to increase at T_0 as T decreases from T ≫ T_c, and that the AFF dominate the SCF at T > T_<sg>, while the SCF dominate at T < T<sg>. This cross-over of the fluctuations causes the anomalous phenomena in the underdoped region. We also obtain the T phase diagram of HTSC consistent with the one observed in experiments.

• 社団法人日本物理学会の論文
• 2001-05-15

著者

• Kuroda Yoshihiro

  Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo Universi

• KOBAYASHI Akito

  Department of Physics,Nagoya University

• MATSUURA Tamifusa

  Department of Physics,Nagoya University

• Tamifusa Matsuura

  Department Of Physics Nagoya University

• Matsuura Tamifusa

  Department Of Physics Nagoya University

• TSURUTA Atsushi

  Department of Physics, Nagoya University

• Kobayashi A

  Institute For Advanced Research Nagoya University

• Kobayashi A

  Department Of Physics Division Of Material Science Nagoya University

• Kobayashi Akito

  Department Of Physics Nagoya University

• Tsuruta A

  Department Of Physics Nagoya University

• Tsuruta Atsushi

  Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University

• Kosuge Yu

  Department Of Physics Nagoya University

• Kuroda Yoshihiro

  Department Of Pharmaceutical Health Care Faculty Of Pharmaceutical Sciences Himeji Dokkyo University

• Kobayashi Akito

  Department Of Physics Division Of Material Science Nagoya University

• KURODA Yoshihiro

  Physics Department, Nagoya University

• MATSUURA Tamifusa

  Physics Department, Nagoya University

• MATSUURA Tamifusa

  Department of Physics, Nagaya University

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