Superconductivity and Density Wave in the Quasi-One-dimensional Systems : Renormalization Group Study(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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The anisotropic superconductivity and the density wave in the quasi-one-dimensional (q1d) system have been studied for a model with interactions of both the backward (g_1) and the forward (g_2) scatterings. By using the one-loop approximation in the Kadanoff-Wilson renormalization group method, it is found that the dependence of response functions on the temperature (T) is proportional to exp (1/T). The phase diagram for the q1d system is obtained on the g_2-g_1 plane, where the noticeable change compared with the purely one-dimensional one appears in the superconducting state. The large charge fluctuation, which is induced by next-nearest neighbor interactions (V_2), suppresses the d_<x^2-y^<2->> wave singlet superconducting (dSS) state but enhances the f-wave triplet superconducting (fTS) state. The field-induced f-wave triplet pairing could be expected for large V_2 since the transition temperature of fTS becomes comparable to that of dSS. These features are discussed to comprehend the experiments on the (TMTSF)_2PF_6 salt.
社団法人日本物理学会の論文
2005-04-15