Doping-induced enhancement of the critical currents of grain boundaries in YBa 2 Cu 3 O 7 − δ
- 1 July 1999
- journal article
- Published by IOP Publishing in Europhysics Letters
- Vol. 47 (1) , 110-115
- https://doi.org/10.1209/epl/i1999-00359-2
Abstract
The critical current density of grain boundaries in YBa2Cu3O7 − δ films is increased beyond the hitherto established limit by overdoping the superconductor. Using Ca-doping, values for the critical current density are obtained, that exceed the highest values reported ever for the undoped material by more than a factor of seven. Further, it is found that the overdoping strongly reduces the grain boundary normal-state resistivity. This systematic improvement of the grain boundary transport properties by doping is of great importance for applications of the high-Tc cuprates and gives insight into the mechanisms controlling the grain boundary behavior.Keywords
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