Increase of Superconducting Correlation due to Dimensionality Change in Quasi-One-Dimensional Conductors(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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Response functions for spin-density-wave (SDW) and d-wave singlet superconductivity (dSC) in quasi-one-dimensional (Q1D) electron systems are calculated by a renormalization group technique. It is shown that the response functions for both SDW, X_s, and dSC, X_d, are enhanced by interchain hopping, t_⊥, i.e., by quasi-one dimensionality. When the Fermi surface deviates from perfect nesting, X_s saturates below the energy scale of imperfectness of the nesting, while X_d is hardly affected. Consequently, the superconducting correlation increases even away from the SDW phase. This gives a possible interpretation of the recent experimental results of Q1D organic conductor (TMTTF)_2SbF_6, where T_c increases even away from the SDW phase.
社団法人日本物理学会の論文
2007-09-15