Phase Diagram of the Electron-Doped Cuprate Superconductors
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概要
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We investigate the T-δ phase diagram of the electron-doped systems in high-T_c cuprates where δ is doping rate. Taking the ingap state and the superexchange interaction J_s, we calculate the superconducting transition temperature T_c, the antiferromagnetic transition temperature T_N, and the NMR relaxation rates l/T_l with the antiferromagnetic fluctuations in the fluctuation-exchange (FLEX) approximation and with the superconducting fluctuations in the self-consistent t-matrix approximation. The obtained phase diagram has features in common with those in the hole-doped systems, including the antiferromagnetic state, the superconducting state and the spin gap phenomenon. Doping dependences of T_N, T_C and T_<SG> (spin gap temperature) are, however, different from those in the hole-doped systems. These differences are due to the intrinsic nature of the ingap state, which have been shown in the d-p model. The ingap state is intimately related to the Zhang-Rice singlets in the hole-doped systems, while it corresponds to correlated d-electrons in the electron-doped systems.
- 社団法人日本物理学会の論文
- 2002-07-15
著者
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Kuroda Yoshihiro
Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo Universi
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KOBAYASHI Akito
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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TSURUTA Atsushi
Department of Physics, Nagoya University
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Kobayashi A
Institute For Advanced Research Nagoya University
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Kobayashi A
Department Of Physics Division Of Material Science Nagoya University
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Kobayashi Akito
Department Of Physics Nagoya University
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Tsuruta A
Department Of Physics Nagoya University
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Tsuruta Atsushi
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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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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Kobayashi Akito
Department Of Physics Division Of Material Science Nagoya University
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KURODA Yoshihiro
Physics Department, Nagoya University
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MATSUURA Tamifusa
Physics Department, Nagoya University
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MATSUURA Tamifusa
Department of Physics, Nagaya University
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Kuroda Tamifusa
Department of Physics, Nagoya University
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