Direct evidence for an intrinsic square vortex lattice in the overdoped high-Tc superconductor La1.83Sr0.17CuO4+d

R. Gilardi , J. Mesot , A. Drew , U. Divakar , S. L. Lee , E. M. Forgan , O. Zaharko , K. Conder

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V. K. Aswal C. D. Dewhurst R. Cubitt N. Momono M. Oda

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords latticevortexsquaredirectintrinsicoverdopedangleanisotropy

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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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Direct evidence for an intrinsic square vortex lattice in the overdoped high-Tc superconductor La1.83Sr0.17CuO4+d

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