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Enhanced Vortex Pinning and Critical Current Density in Proton-Irradiated YBa2Cu3O7-δ Thin Films

  • E. L. Venturing (a1), M. P. Siegal (a1), A. E. White (a1), S. Y. Hou (a2) and Julia M. Phillips (a2)...

Abstract

The appropriate fluence of 2.0 MeV H1 ions has been shown previously to enhance the critical current density Jc by a factor of two at a magnetic field of 0.9 tesla in 1000 Å thick epitaxial films of YBa2Cu3O7-δ grown by the ex situ BaF2 process. The as-grown films exhibit single crystal-like behavior in both atomic ordering and Jc versus temperature and magnetic field. TRIM simulations suggest that H+ irradiation generates mainly point delects throughout the crystal structure. We show here that such defects result in an even greater enhancement of Jc for fields above 1 tesla plus a significant increase in the apparent vortex pinning potential deduced from magnetization relaxation data.

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Enhanced Vortex Pinning and Critical Current Density in Proton-Irradiated YBa2Cu3O7-δ Thin Films

  • E. L. Venturing (a1), M. P. Siegal (a1), A. E. White (a1), S. Y. Hou (a2) and Julia M. Phillips (a2)...

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