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

D. J. Campbell, M. Frachet, S. Benhabib +10

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 transit…