R. Ghez, J.S. Lew
Journal of Crystal Growth
We have created randomly oriented columnar defects in textured Bi2Sr2CaCu2Ox/Ag superconducting tapes and Tl-2212 materials, using a fission process driven by irradiation with 0.8 GeV protons. Vortex pinning was significantly improved, leading to increased persistent current density J. The thermally activated decay of current with time was greatly decreased, compared with unirradiated materials. Nonetheless, temperature-independent vortex motion from quantum tunneling limits J and its stability in time. Analysis of the time-dependent studies provides estimates for the elementary vortex attempt time τ, for both as-formed and ion-processed materials.
R. Ghez, J.S. Lew
Journal of Crystal Growth
I.K. Pour, D.J. Krajnovich, et al.
SPIE Optical Materials for High Average Power Lasers 1992
J.R. Thompson, Yang Ren Sun, et al.
Physica A: Statistical Mechanics and its Applications
David B. Mitzi
Journal of Materials Chemistry