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Author (up) Chan, I.N.; Vier, D.C.; Nakamura, O.; Hasen, J.; Guimpel, J.; Schultz, S.; Schuller, I.K.
Title Thickness dependence of the superconducting transition temperature of YBCO Type Journal Article
Year 1993 Publication Physics Letters A Abbreviated Journal
Volume 175 Issue 3-4 Pages 241-245
Abstract We have performed detailed structural and superconducting studies of YBCO single layers, YBCO/PrBCO/YBCO tri-layers, and YBCO/PrBCO superlattices. The results for single layers indicate that a nominally one unit cell thick YBCO film sandwiched between PrBCO layers is not superconducting. However, a superlattice with nominally one unit cell thick YBCO layers has a measurable superconducting temperature onset (Tco). These apparently contradictory results are reconciled by experiments on YBCO/PrBCO/YBCO tri-layers which, due to coupling across the PrBCO insulating layer, exhibit superconductivity for PrBCO thicknesses below 200 Ã…. Structural studies show that the length scale of the superconductive coupling is much larger than the length scale of the step disorder and interdiffusion present in the film.
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ISSN 0375-9601 ISBN Medium
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Call Number BT @ jguimpel @ Serial 623
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