Charge-Fluctuation-Induced Superconducting State in Two-Dimensional Quarter-Filled Electron Systems

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Author(s)

Abstract

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.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 73(5), 1115-1118, 2004-05-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110001954818
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00319015
  • NDL Article ID
    6940639
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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