Competition of Point and Correlated Vortex Pinning in Irradiated YBCO

ORAL

Abstract

We present a systematic study of vortex pinning on an optimal-doped untwinned YB$_{2}$Cu$_{3}$O$_{7-\delta }$ single-crystal irradiated with 1.4 GeV Pb ions and subsequently irradiated with protons. Irradiation to a dose matching field of B$_{\Phi }$=2T completely transforms the first order vortex melting transition to a higher order Bose glass transition. The transformation is also marked by a pronounced increase in vortex pinning at all temperatures, determined from SQUID measurements. We compare the irreversibility line and the remanent moment of the irradiated sample after subsequent irradiation with protons to determine the contribution to vortex pinning from point and correlated defects on the same sample.

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Authors

  • Wai -K Kwok

    Argonne National Laboratory, Argonne National Lab, Materials Science Division, Argonne National Laboratory, Material Science Division, Argonne National Laboratory

  • U. Welp

    MSD, Argonne National Laboratory, Argonne National Laboratory, Materials Science Division, Argonne National Laboratory, Material Science Division, Argonne National Laboratory

  • John Schlueter

    Materials Science Division, Argonne National Laboratory

  • R. Xie

    Materials Science Division, Argonne National Laboratory, Material Science Division, Argonne National Laboratory

  • Jiong Hua

    Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, Dept. of Physics, Northern Illinois University

  • Zhili Xiao

    Dept. of Physics, Northern Illinois University

  • Lisa M. Paulius

    Dept. of Physics, Western Michigan University

  • M.R. Eskildsen

    Dept. of Physics, U.of Notre Dame, Notre Dame, IL, USA, University of Notre Dame, Dept. of Physics, University of Notre Dame, Department of Physics, University of Notre Dame