Spin-Triplet Superconductivity Mediated by Phonons in Quasi-One-Dimensional Systems

Details Spin-Triplet Superconductivity Mediated by Phonons in Quasi-One-Dimensional Systems Spin-Triplet Superconductivity Mediated by Phonons in Quasi-One-Dimensional Systems

2004-07-12

arxiv.org/abs/cond-mat/0407286v3

J. Phys. Soc. Jpn. Vol.73, No.11 (2004) pp.3121-3128

Physics

Condensed Matter

Superconductivity

8 pages, 15 figures, with jpsj2.cls

Scientific paper

10.1143/JPSJ.73.3121

We investigate the spin-triplet superconductivity mediated by phonons in quasi-one-dimensional (Q1D) systems with open Fermi surfaces. We obtain the ground state phase diagrams. It is found that spin-triplet superconductivity occurs for weak screening and strong on-site Coulomb interaction, even in the absence of any additional nonphonon pairing interactions. We find that the nodeless spin-triplet state is more favorable than the spin-triplet state with line nodes, for the parameter values of the Q1D superconductors (TMTSF)_2X. We also find that Q1D open Fermi surface, which is the specific feature of this system, plays an essential role in the pairing symmetry. We discuss the compatibility of the present results with the experimental results in these compounds.

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