Local probe of vortex pinning energies in the Bose glass
- The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Columnar defects provide strong pinning centers for vortices in high-{ital T}{sub {ital c}} superconductors, increasing global critical currents. Using a magnetometer array of micron dimensions, we characterize the {ital local} field profiles in untwinned single crystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} with equivalent columnar defect densities {ital B}{sub {phi}}. We find that the critical current is large only where the internal magnetic field {ital B}{lt}{ital B}{sub {phi}}. In regions of the crystal where {ital B}{gt}{ital B}{sub {phi}}, the critical current is sharply reduced. We model both local and global critical current measurements by generalizing the Bean picture to the case of irradiated high-{ital T}{sub {ital c}} superconductors.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 122323
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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