Charge-Fluctuation-Induced Superconducting State in Two-Dimensional Quarter-Filled Electron Systems (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
- 論文の詳細を見る
We investigate superconducting (SC) states in a two-dimensional extended Hubbard model at quarter-filling with on-site repulsive interaction (U) and nearest-neighbor repulsive interaction (V), which lead to spin fluctuation and charge fluctuation, respectively. The effect of charge fluctuation on the onset of the SC state is estimated by calculating pairing interaction within the random phase approximation. Solving a linearized Eliashberg equation with an anomalous self-energy as a function of both momentum and frequency, we examine the stability of a singlet SC state in a phase diagram of U and V with fixed temperatures. We obtain a novel result that the obtained SC state has d_<xy> symmetry in the vicinity of both spin density wave (SDW) phase (U ≳ V) and charge density wave (CDW) phase (V ≳ U). The CDW-SC and SC-metal phase boundaries exhibit reentrant structures on the V-T (temperature) plane.
- 社団法人日本物理学会の論文
- 2004-05-15
著者
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Tanaka Yasuhiro
Department Of Cardiovascular Medicine Tokyo Medical And Dental University
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SUZUMURA Yoshikazu
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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Kobayashi Akito
Department Of Physics Division Of Material Science Nagoya University
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo
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Suzumura Yoshikazu
Department Of Physics Nagoya University
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Suzumura Yoshikazu
Department Of Physics University Of Tokyo
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Suzumura Yoshikazu
Department Of Physics Faculty Of Science Tohoku University
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Tanaka Yasuhiro
Department Of Advance Materials Science Faculty Of Engineering Kagawa University
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Tanaka Yasuhiro
Department Of Physics University Of Tokyo
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Science University Of Tokyo
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