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

Abstract

We have theoretically investigated the spin and charge fluctuations in the quasi-one dimensional organic superconductor (TMTSF)2ClO4. Using the extended multi-site Hubbard model, which contains four sites in a unit cell and the transfer energies obtained by the extended Hückel method, we calculate the linearized gap equation with the random phase approximation, to find novel order parameters of superconductivity due to several kinds of charge fluctuations induced by the anisotropic intersite repulsive interactions. For the singlet state, the order parameter with line nodes appears in the case of the strong charge fluctuation, while the order parameter with anisotropic gap suggested by Shimahara is reproduced in the spin fluctuation. The triplet state is also obtained for the wide parameter range of repulsive interactions due to a cooperation between charge and spin fluctuations.

11 pages, 7 figures

References in corpus (6)

• Anomalous In-Plane Anisotropy of the Onset of Superconductivity in (TMTSF)2ClO4
• Triplet superconducting pairing and density-wave instabilities in organic conductors
• Magnetic-Field Variations of the Pair-Breaking Effects of Superconductivity in (TMTSF)2ClO4
• Strong parity mixing in the FFLO superconductivity in systems with coexisting spin and charge fluctuations
• Strong magnetic field enhancement of spin triplet pairing arising from coexisting $2k_F$ spin and $2k_F$ charge fluctuations
• Generalized susceptibility of quasi-one dimensional system with periodic potential: model for the organic superconductor (TMTSF)${}_2$ClO${}_4$

Cited by in corpus (3)

• Nodal Superconducting Order Parameter and Thermodynamic Phase Diagram of (TMTSF)2ClO4
• Novel superconducting phenomena in quasi-one-dimensional Bechgaard salts
• Microscopic theory of a superconducting gap in the quasi-one-dimensional organic conductor (TMTSF)${}_2$ClO${}_4$: Model derivation and two-particle self-consistent analysis