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arXiv · 2111.11456

Evidence for a square-square vortex lattice transition in a high-$T_\textrm{c}$ cuprate superconductor

D. J. Campbell·M. Frachet·S. Benhabib·I. Gilmutdinov·C. Proust·T. Kurosawa·N. Momono·M. Oda·M. Horio·K. Kramer·J. Chang·M. Ichioka·D. LeBoeuf
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Abstract

Using sound velocity and attenuation measurements in high magnetic fields, we identify a new transition in the vortex lattice state of La$_{2-x}$Sr$_{x}$CuO$_4$ (LSCO). The transition, observed in magnetic fields exceeding 35 T and temperatures far below zero field $T_c$, 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 degrees rotation of the square vortex lattice, predicted to occur in $d$-wave superconductors near a van Hove singularity.

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D. J. Campbell, M. Frachet, S. Benhabib, I. Gilmutdinov, C. Proust, T. Kurosawa, N. Momono, M. Oda, M. Horio, K. Kramer, J. Chang, M. Ichioka, D. LeBoeuf. 2021-11-22. Evidence for a square-square vortex lattice transition in a high-$T_\textrm{c}$ cuprate superconductor. https://doi.org/10.1103/physrevlett.129.067001

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