Published November 1, 1995 | Published
Journal Article Open

Local probe of vortex pinning energies in the Bose glass

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Abstract

Columnar defects provide strong pinning centers for vortices in high-T_c superconductors, increasing global critical currents. Using a magnetometer array of micron dimensions, we characterize the local held profiles in untwinned single crystals of YBa_2Cu_3O_(7-δ) with equivalent columnar defect densities B_φ. We find that the critical current is large only where the internal magnetic field BB _ φ, 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-T_c superconductors.

Additional Information

© 1995 The American Physical Society. Received 5 July 1995. We thank V. Vinokur for illuminating discussions, and we are indebted to J. Hettinger and B. Glagola for making the crystal irradiation at ATLAS a success. This work was supported by the National Science Foundation (DMR91-20000) through the Science and Technology Center for Superconductivity. G.W.C. acknowledges support from the U.S. Department of Energy, Basic Energy Sciences-Materials Science under Contract No. W-31-109-ENG-38.

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