Intrinsic superconductor/normal-metal/superconductor-like weak links in Y1Ba2Cu3O7-x thin films

England, P.; Venkatesan, T.; Wu, X. D.; Inam, A.; Hegde, M. S.; Cheeks, T. L.; Craighead, H. G.
December 1988
Applied Physics Letters;12/5/1988, Vol. 53 Issue 23, p2336
Academic Journal
Magnetotransport measurements on micron-sized wires of the thin-film high Tc superconductor Y1 Ba2 Cu3 O7-x made by pulsed laser deposition reveal an exponential suppression of the critical current with magnetic field, and a power law dependence of the critical current on reduced temperature. We ascribe this behavior to crystallographic defects in the film which behave as superconductor/normal-metal/superconductor weak links in a magnetic field. From the measurements we estimate a critical current density of 106 A cm-2 in a field of 16 T at 4.2 K.


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