Superconductivity in Charge Ordered Organic Conductor : α-(ET)_2I_3 Salt

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Author(s)

Abstract

We theoretically examine superconductivity in quasi-two-dimensional organic conductor, α-(ET)_2I_3 salt, which has been found under uniaxial pressure and at temperature below the charge ordering. The interplay of many bands and several repulsive interactions gives rise to novel role of the charge ordering (CO), which leads to the coexistence with the superconducting (SC) state. The hole and electron pockets at Fermi surface, which exist in normal state and at ambient pressure, vanish in the charge ordered insulating state due to the formation of the charge gap. Under pressures, the charge gap disappears and the narrow gap semiconductor (NGS) with CO exhibits the density of state with a sharp peak just below the Fermi energy. Based on the mean field of CO state, charge and spin susceptibilities, and the paring interaction are evaluated by using the random phase approximation. The onset for the SC state is calculated in terms of a linearized Eliashberg equation, where the pairing interaction consists of both charge and spin fluctuations. The NGS results in the exotic SC state, which exhibits an extended s-state with large anisotropy of the gap. It is shown that the SC state is the inter-site pairing and is governed by the inter-site spin fluctuation.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 73(11), 3135-3148, 2004-11-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110001979269
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00319015
  • NDL Article ID
    7157114
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS 
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