Distortional weak-coupling instability of Bogoliubov Fermi surfaces

  title={Distortional weak-coupling instability of Bogoliubov Fermi surfaces},
  author={Carsten Timm and P. M. R. Brydon and Daniel Agterberg},
  journal={Physical Review B},
Centrosymmetric multiband superconductors which break time-reversal symmetry generically have two-dimensional nodes, i.e., Fermi surfaces of Bogoliubov quasiparticles. We show that the coupling of the electrons to the lattice always leads to a weak-coupling instability of such a state toward spontaneous breaking of inversion symmetry at low temperatures. This instability is driven by a Cooper logarithm in the internal energy but the order parameter is not superconducting but distortional. We… 

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