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- W2883313689 abstract "We derive the effective Ginzburg-Landau (GL) theory for finite-momentum [Fulde-Ferrell-Larkin-Ovchinnikov/pair-density wave (FFLO/PDW)] superconductivity without spin population imbalance from a model with local attraction and repulsive pair hopping. We find that the GL free energy must include up to sixth-order derivatives of the order parameter, providing a unified description of the interdependency of zero and finite-momentum superconductivity. For weak pair hopping the phase diagram contains a line of Lifshitz points where vanishing superfluid stiffness induces a continuous change to a long wavelength FF state. For larger pair hopping there is a bicritical region where the pair momentum changes discontinuously. Here the FF type state is near degenerate with the LO or PDW type state. At the intersection of these two regimes there is a ``super-Lifshitz'' point with extra soft fluctuations. The instability to finite-momentum superconductivity occurs for arbitrarily weak pair hopping for sufficiently large attraction suggesting that even a small repulsive pair hopping may be significant in a microscopic model of strongly correlated superconductivity. Several generic features of the model may have bearing on the cuprate superconductors, including the suppression of superfluid stiffness in proximity to a Lifshitz point as well as the existence of subleading FFLO order (or vice versa) in the bicritical regime." @default.
- W2883313689 created "2018-08-03" @default.
- W2883313689 creator A5002881429 @default.
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- W2883313689 date "2018-12-04" @default.
- W2883313689 modified "2023-10-15" @default.
- W2883313689 title "Suppression of superfluid stiffness near a Lifshitz-point instability to finite-momentum superconductivity" @default.
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- W2883313689 doi "https://doi.org/10.1103/physrevb.98.224501" @default.
- W2883313689 hasPublicationYear "2018" @default.
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