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Published on: March 24, 2019
Broken translational and time-reversal symmetry in unconventional superconducting films
1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
Abstract:
We demonstrate that films of an unconventional (d-wave) superconductor at temperatures T < approximately 0.43Tc can exhibit unusual superconducting phases. The new ground states beside the broken gauge and the point group symmetries can spontaneously break (i) continuous translational symmetry and form periodic order parameter structures in the plane of the film, or (ii) time-reversal symmetry and develop a supercurrent flowing along the film. These states are the result of the strong transverse inhomogeneity present in films with a thickness of several coherence lengths. We show a natural similarity between the formation of these states and the Fulde-Ferrell-Larkin-Ovchinnikov state.
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