# Distortional weak-coupling instability of Bogoliubov Fermi surfaces

@article{Timm2020DistortionalWI, title={Distortional weak-coupling instability of Bogoliubov Fermi surfaces}, author={Carsten Timm and P. M. R. Brydon and Daniel Agterberg}, journal={Physical Review B}, year={2020}, volume={103}, pages={024521} }

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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