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Anisotropic Electrical Resistivity of YBCO/PBCO Superlattice Films Grown on Miscut Substrates

Published online by Cambridge University Press:  26 February 2011

H. R. Kerchner ,
C. E. Klabunde ,
D. K. Christen ,
J. D. Budai ,
D. H. Lowndes ,
D. Norton  and
J. O. Thomson
H. R. Kerchner
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6061
C. E. Klabunde
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6061
D. K. Christen
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6061
J. D. Budai
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6061
D. H. Lowndes
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6061
D. Norton
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6061
J. O. Thomson
Affiliation:
Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996- 1200.
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Abstract

Anisotropie electrical resistivity is studied in epitaxial superlattice films of YBa2Cu3O7-δ/PrBa2Cu3O7-ε grown in situ by laser ablation on SrTiO3 surfaces aligned slightly away from the [100] direction. Layer thicknesses of each compound range from two to eight atomic cells. Electrical resistivity of these superlattice films always shows a peak at some cryogenic temperature that decreases with increasing PrBa2Cu3O7-ε layer thickness. Clear evidence is seen of vortex pinning or of supercurrent blocking by the step edges or by twin boundaries. The ratio of electrical resistivities for current directions parallel and perpendicular to these boundaries shows a large step-like change just above the superconductive critical temperature. The possibility is discussed that the Kosterlitz-Thouless transition explains this anisotropy change.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 353
Copyright
Copyright © Materials Research Society 1992

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References

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