Evidence for a square-square vortex lattice transition in a high-T c cuprate superconductor

D. J. J Campbell (1) , M. Frachet (1) , S. Benhabib (1) , I. Gilmutdinov (1) , C. Proust (1) , T. Kurosawa (2) , N. Momono (3) , M. Oda (2) , M. Horio (4) , K. Kramer (4) , J. Chang (4) , M. Ichioka (5) , David Leboeuf (6)

1 LNCMI-T - Laboratoire national des champs magnétiques intenses - Toulouse
2 Hokkaido University [Sapporo, Japan]
3 Muroran Institute of Technology
4 Physik-Institut [Zürich]
5 RCIS - Research Core for Interdisciplinary Sciences [Okayama]
6 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble

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.

Domaines: Supraconductivité [cond-mat.supr-con]

D. J. J Campbell, M. Frachet, S. Benhabib, I. Gilmutdinov, C. Proust, et al.. Evidence for a square-square vortex lattice transition in a high-T c cuprate superconductor. Physical Review Letters, 2022, ⟨10.1103/PhysRevLett.129.067001⟩. ⟨hal-03445700⟩