P. Chaudhari
Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Paper
Critical currents in [001] grains and across their tilt boundaries in YBa2Cu3O7 Films
Abstract
The temperature and magnetic field dependences of the critical-current density of superconducting YBa2Cu3O7 films have been determined from transport measurements across individual [001] tilt boundaries and within single [001] grains. The results provide evidence that the basal-plane Jf is limited by flux creep. In contrast, the I-V characteristics and the temperature magnetic field dependences of the grain-boundary Jc are consistent with a superconductor- normal-superconductor-type weak-link behavior. These results imply that the transport properties of these materials can be treated within a BCS framework. © 1988 The American Physical Society.
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