Evidence for a square-square vortex lattice transition in a high-T c cuprate superconductor
Résumé
Using sound velocity and attenuation measurements in high magnetic fields, we identify a new transition in the vortex lattice state of La2−xSrxCuO4 (LSCO). The transition, observed in magnetic fields exceeding 35 T and temperatures far below zero field Tc, is detected in the compression modulus of the vortex lattice, at a doping level x = p = 0.17. Our theoretical analysis based on Eilenberger theory of vortex lattice shows that the transition corresponds to the long-sought 45 • rotation of the square vortex lattice, predicted to occur in d-wave superconductors near a van Hove singularity.
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