Superconductivity in Charge Ordered Metal for Quasi-Two-Dimensional Organic Conductor(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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The superconductivity that occurs below the charge ordering temperature in a quasi-two-dimensional (quasi-2D) organic conductor, the α-(ET)_2I_3 salt, has been examined by applying the mean field theory and the random phase approximation to the extended Hubbard model with four sites in the unit cell and anisotropic nearest-neighbor interactions. It is shown that, under uniaxial pressure, the insulating phase moves to the metal phase with small pockets of electrons and holes, while the charge ordering state with the horizontal stripe pattern is retained. The novel property of the metal phase gives rise to the superconducting (SC) state with the full gap. It is found that the pairing interaction for the superconductivity is given mainly by the spin fluctuation existing between hole-rich sites in the unit cell. The role of the anisotropic repulsive interaction is discussed for the mechanism of the present SC state.
- 社団法人日本物理学会の論文
- 2005-11-15
著者
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KOBAYASHI Akito
Department of Physics,Nagoya University
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Suzumura Y
名古屋大 大学院理学研究科
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SUZUMURA Yoshikazu
Department of Physics, 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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KATAYAMA Shinya
Department of Physical Electronics, Tokyo Institute of Technology
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Kobayashi Akito
Department Of Physics Division Of Material Science Nagoya University
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Katayama Shinya
Department Of Physics Nagoya University
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Katayama Shinya
Department Of Physical Electronics Tokyo Institute Of Technology:(present Address)nippon Sheet Glass
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Suzumura Yoshikazu
Department Of Physics Nagoya University
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Suzumura Yoshikazu
Department Of Physics Faculty Of Science Tohoku University
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