Damping Effect on Spin-Lattice Relaxation Rate in Organic Superconductors

概要

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The electrical resistivity in organic superconductors show the T'-dependence at low tempera-tures above T.. This fact suggests that the electron-electron interaction determines the dampingof quasi-particle in the Fermi liquid state. In this paper, we calculate selfconsistently the term-perature dependence of damping rate due to the electron-electron interaction. Then, using thisdamping rate, we calculate the temperature dependence of NIVIR relaxation rate, for the twocases with s and d-pairing states, respectively. Otrr result shows that, when the damping rateat T. is of the same order as T., no coherence peak appears in T. " even if the superconductingstate possesses .s-wave sytnmetry. However, we cannot eliminate a huznp structure appearing atlow temperatures, at which the .s-wave gap begins to open against the danaping effect. On theother hand, the relaxation rate for d-wave decreases smoothly. This is the important differencein determining the pairing symmetry. We disctrss the comparison of our result with experimentaldata for several systems.
社団法人日本物理学会の論文
1996-06-15