Symmetries of the quasi-1d Bechgaard salts superconducting state in an applied magnetic field

Abstract

We investigate the possible superconducting pairing symmetries which would account for the latest experimental results on the Bechgaard salts. Using a renormalization group (R.G) technique we calculate the couplings of the singlet and triplet interactions in the quasi 1D Hamiltonian. In the presence of interchain interactions, the singlet and triplet couplings are of the same order of magnitude. The renormalized couplings are then used in an RPA calculation to evaluate the critical fields of superconductivity for the two dominant order parameter symmetries in the R.G flow, i.e, the dx2-y2 and fy symmetries. It is shown that, for the standard values of the anisotropy ratio of the Fermi surface, the critical fields of the singlet symmetry are strongly reduced. A reentrant superconductivity is however still present for the triplet state.

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• Antiferromagnetic superconductors with effective mass anisotropy in magnetic fields
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• Functional Renormalization Group calculation of the Fermi surface of a spin-ladder

Cited by in corpus (12)

• Strong parity mixing in the FFLO superconductivity in systems with coexisting spin and charge fluctuations
• Organic Superconductors: when correlations and magnetism walk in
• Novel superconducting phenomena in quasi-one-dimensional Bechgaard salts
• On the Origin of the Anomalous Upper Critical Field in Quasi-One-Dimensional Superconductors
• Mechanism for the Singlet to Triplet Superconductivity Crossover in Quasi-One-Dimensional Organic Conductors
• Pairing competition in a quasi-one-dimensional model of organic superconductors (TMTSF)${}_{2}X$ in magnetic field
• Experimental Evidences of Quantum Phase Transition in a Spin Cluster Compound
• Triplet superconductivity in coupled odd-gon rings
• 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
• Competition between different order parameters in a quasi-one-dimensional superconductor
• Generic nodeless Larkin Ovchinnikov states due to singlet-triplet mixing
• Superconducting and density-wave instabilities of low dimensional conductors with a Zeeman coupling to a magnetic field