| he growth mechanism and electrical transport properties of YBa;The transport properties of these as-grown epitaxial YBCO thin films have been described in terms of thermally activated flux motion. The analysis employs a pinning potential that depends on the current density J, the temperature T, and the applied magnetic field B. These dependencies are determined from a range of measurements: the activated resistivity for fields ;After studying heavy-ion irradiated YBCO films, we observed that the irreversibility line shifts close to the flux-melting line, i.e., the thermally activated flux flow (TAFF) region is reduced, and the glassy region is also extended because of strong pinning. Using Brandt's flux depinning model, the pinning potential U and depinning current density... |
