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We have theoretically investigated the spin and charge fluctuations in thequasi-one dimensional organic superconductor (TMTSF)2ClO4. Using the extendedmulti-site Hubbard model, which contains four sites in a unit cell and thetransfer energies obtained by the extended H\"uckel method, we calculate thelinearized gap equation with the random phase approximation, to find novelorder parameters of superconductivity due to several kinds of chargefluctuations induced by the anisotropic intersite repulsive interactions. Forthe singlet state, the order parameter with line nodes appears in the case ofthe strong charge fluctuation, while the order parameter with anisotropic gapsuggested by Shimahara is reproduced in the spin fluctuation. The triplet stateis also obtained for the wide parameter range of repulsive interactions due toa cooperation between charge and spin fluctuations.

Role of charge fluctuation in Q1D organic superconductor (TMTSF)2ClO4