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Proceedings Paper

Growth and transport properties of Y-Ba-Cu-O/Pr-Ba-Cu-O superlattices
Author(s): Douglas H. Lowndes; David P. Norton; J. D. Budai; D. K. Christen; C. E. Klabunde; R. J. Warmack; Stephen J. Pennycook
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Paper Abstract

The pulsed-laser deposition method has been used to fabricate epitaxial, nonsymmetric M(Y) x N(Pr) superlattices in which YBa2Cu3O7 (YBCO) layers either M = 1, 2, 3, 4, 8, or 16 c-axis unit cells thick are separated by insulating PrBa2Cu3O7 (PBCO) layers N unit cells thick (N = I to -32). The zero-resistance superconducting transition temperature, Tc0, initially decreases rapidly with increasing PBCO layer thickness, but then saturates at TcO 19 K, 54 K, 71 K, or 80 K, for structures containing 1-, 2-, 3-, or 4-cell-thick YBCO layers, respectively. Critical current density measurements carried out on structures with 16- or 32-cell thick YBCO layers show that the magnitude of Jc(H 0) 12 MA/cm2, as well as the magnetic field dependence and the anisotropy of Jc(H) all are in good agreement with corresponding measurements on thicker, single-layer YBCO films. Thus, there is no evidence of an enhanced Jc(H) due to the multi-layered structure, for the layer thicknesses investigated to date. The systematic variation of Tc0, as a function of the YBCO and PBCO layer thicknesses, is discussed in light of other recent experiments and theoretical model calculations. The superlattices' structural and compositional order are characterized using x-ray diffraction, transmission electron microscopy, and scanning tunneling microscopy, and details of the pulsed-laser deposition process are reported.

Paper Details

Date Published: 1 March 1991
PDF: 11 pages
Proc. SPIE 1394, Progress In High-Temperature Superconducting Transistors and Other Devices, (1 March 1991); doi: 10.1117/12.25741
Show Author Affiliations
Douglas H. Lowndes, Oak Ridge National Lab. (United States)
David P. Norton, Oak Ridge National Lab. (United States)
J. D. Budai, Oak Ridge National Lab. (United States)
D. K. Christen, Oak Ridge National Lab. (United States)
C. E. Klabunde, Oak Ridge National Lab. (United States)
R. J. Warmack, Oak Ridge National Lab. (United States)
Stephen J. Pennycook, Oak Ridge National Lab. (United States)

Published in SPIE Proceedings Vol. 1394:
Progress In High-Temperature Superconducting Transistors and Other Devices
Rajendra Singh; Jagdish Narayan; David T. Shaw, Editor(s)

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