Strong parity mixing in the FFLO superconductivity in systems with coexisting spin and charge fluctuations

Abstract

We study the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state of spin fluctuation mediated pairing, and focus on the effect of coexisting charge fluctuations. We find that (i) consecutive transitions from singlet pairing to FFLO and further to $S_z=1$ triplet pairing can generally take place upon increasing the magnetic field when strong charge fluctuations coexist with spin fluctuations, and (ii) the enhancement of the charge fluctuations lead to a significant increase of the parity mixing in the FFLO state, where the triplet/singlet component ratio in the gap function can be close to unity. We propose that such consecutive pairing state transition and strong parity mixing in the FFLO state may take place in a quasi-one-dimensional organic superconductor (TMTSF)${}_{2}X$.

5 pages, 5 figures. To be published in Phys. Rev. Lett

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Cited by in corpus (16)

• Odd-frequency Superconductivity on a Quasi-one-dimensional Triangular Lattice in the Hubbard Model
• Theory of pairing symmetry in Fulde-Ferrell-Larkin-Ovchinnikov vortex state and vortex lattice
• Novel superconducting phenomena in quasi-one-dimensional Bechgaard salts
• Dimensional Crossover of the Fulde-Ferrell-Larkin-Ovchinnikov State in Strongly Pauli-Limited Quasi-One-Dimensional Superconductors
• 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
• Pairing mechanism of unconventional superconductivity in doped Kane-Mele model
• Degeneracy between even- and odd-parity superconductivity in the quasi-1D Hubbard model and implications for Sr2RuO4
• 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
• Role of charge fluctuation in Q1D organic superconductor (TMTSF)2ClO4
• Generic nodeless Larkin Ovchinnikov states due to singlet-triplet mixing
• Stabilization of the Fulde-Ferrell-Larkin-Ovchinnikov State by Tuning In-plane Magnetic-Field Direction: Application to a Quasi-One-Dimensional Organic Superconductor
• Mixing of odd- and even-frequency pairings in strongly correlated electron systems under magnetic field
• Superconducting and density-wave instabilities of low dimensional conductors with a Zeeman coupling to a magnetic field
• FFLO oscillations and magnetic domains in the Hubbard model with off-diagonal Coulomb repulsion