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.
*This work was supported by the U.S. Department of Energy, Office of Science, BES - Materials Science and Division of Nuclear Physics (ATLAS) under grant no. W-31-109-ENG-38.
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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
