Pinning centres in YBa2Cu3O7- deltafilms
- 1 January 1992
- journal article
- Published by IOP Publishing in Superconductor Science and Technology
- Vol. 5 (1S) , S125-S128
- https://doi.org/10.1088/0953-2048/5/1s/024
Abstract
Pinning centers in epitaxial YBa2Cu3O7- delta films have been investigated by scanning tunneling microscopy and transport studies. An astonishing surface morphology has been found which includes a high density approximately=109 cm-2 of screw dislocations and nanometer-sized holes. The density of screw dislocations can be controlled by varying the growth conditions of the YBa2Cu3O7- delta films, allowing correlations between critical currents and screw dislocation density to be investigated. Films with higher screw dislocation densities are observed to have higher critical current densities and a slower drop of Jc(H).Keywords
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