Direct evidence for an intrinsic square vortex lattice in the overdoped high-Tc superconductor La1.83Sr0.17CuO4+d
Gilardi, R. · Mesot, J. · Drew, A. · Divakar, U. · Lee, S. L. · Forgan, E. M. · Zaharko, O. · Conder, K. · Aswal, V. K. · Dewhurst, C. D. · Cubitt, R. · Momono, N. · Oda, M.
Original · EN
We report here the first direct observations of a well ordered vortex lattice in the bulk of a La(2-x)Sr(x)CuO(4+d) (La214) single crystal (slightly overdoped, x=0.17). Our small angle neutron scattering investigation of the mixed phase reveals a crossover from triangular to square coordination with increasing magnetic field. The existence of an intrinsic square vortex lattice has never been observed in high-temperature superconductors (HTSC), and is indicative of the coupling of the vortex lattice to a source of anisotropy, such as those provided by a d-wave order parameter or the presence of stripes.
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