J Mannhart et al 1992 Supercond. Sci. Technol. 5 S125 doi:10.1088/0953-2048/5/1S/024
J Mannhart, D Anselmetti, J G Bednorz, Ch Gerber, K A Muller and D G Schlom
Show affiliationsPinning 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).
74.25.Qt Vortex lattices, flux pinning, flux creep
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
Issue 1S (January 1992)
J Mannhart et al 1992 Supercond. Sci. Technol. 5 S125
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