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

  • H. R. Kerchner (a1), C. E. Klabunde (a1), D. K. Christen (a1), J. D. Budai (a1), D. H. Lowndes (a1), D. Norton (a1) and J. O. Thomson (a2)...

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.

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1. Lowndes, Douglas H., Norton, David P., and Budai, J. D., Phys. Rev. Lett. 65, 1160 (1990).
2. Lowndes, Douglas H., Norton, David P., Budai, J. D., Pennycook, S. J., Christen, D. K., Sales, B. C., and Feenstra, R., p. 153 in Spring Meeting of the Materials Research Society Symposium N: Laser Ablation for Materials Synthesis Proceeding, edited by Paine, D. C. and Bravman, J. C. (Materials Research Society, Pittsburgh, PA, 1990).
3. Lowndes, D. H., Zheng, X. -Y., Zhu, Shen, Budai, J. D., and Warmack, R. J., “Suppression of the Spiral-Growth Mechanism in Epitaxial YBa2Cu3O7−x Films Grown on Miscut Substrates”, to be published.
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Anisotropic Electrical Resistivity of YBCO/PBCO Superlattice Films Grown on Miscut Substrates

  • H. R. Kerchner (a1), C. E. Klabunde (a1), D. K. Christen (a1), J. D. Budai (a1), D. H. Lowndes (a1), D. Norton (a1) and J. O. Thomson (a2)...

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