R.M. Macfarlane, R.L. Cone
Physical Review B - CMMP
A series of YBa2Cu3O7-δ(YBCO) epitaxial films and crystals were irradiated with energetic heavy ions (Sn30+ or Ag29+ at energy 0.58 GeV) to produce columnar defects of highly disordered material. The irreversibility lines, B*(T), show enhancement due to the increased pinning. However, while B* does not exceed that observed in the highest-Jc as-grown epitaxial thin films, the values approach the proposed vortex melting line determined by a number of experiments on nearly defect-free single crystals. These results are interpreted in terms of the predicted upper limit of pinning energies in anisotropic superconductors, and the thermally-induced decoupling of vortex segments. © 1994.
R.M. Macfarlane, R.L. Cone
Physical Review B - CMMP
Ming L. Yu
Physical Review B
R. Ghez, M.B. Small
JES
U. Wieser, U. Kunze, et al.
Physica E: Low-Dimensional Systems and Nanostructures