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Proceedings Paper

Role of interface orientation in the coupling of an anisotropic superconductor with a normal conductor
Author(s): Emil Polturak; Orna Nesher; Gad Koren
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Paper Abstract

The coupling between a HTSC thin film (S) and a normal conductor (N) in proximity is still not well understood. Most of the investigations done so far look at the penetration of superconductivity into N. We have extended this type of investigation to look at the other side of the coin, namely at the influence of N on S. Here, we report measurements of the critical temperature of S-N bilayer films as a function of the thickness of the YBCO (S) layer using Co doped YBCO as the Normal material. To understand the role of the S-N interface, bilayer having different interface morphologies were prepared using different growth modes of the films. We found that depending on the morphology of the S-N interface, the coupling between S and N layers can be turned on to depress the Tc of S by tens of degrees, or turned off so the layers appear almost totally decoupled. This novel effect is strongly correlated with the presence of different crystalline orientations on the interface. The range of influence of N on S is about 240 angstrom, rather than 20 angstrom expected from the coherence length (xi) s. These observations are explained using a theory of quasiparticle transmission into an anisotropic superconductor.

Paper Details

Date Published: 22 December 1998
PDF: 6 pages
Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); doi: 10.1117/12.335909
Show Author Affiliations
Emil Polturak, Technion--Israel Institute of Technology (Israel)
Orna Nesher, Technion--Israel Institute of Technology (Israel)
Gad Koren, Technion--Israel Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 3481:
Superconducting and Related Oxides: Physics and Nanoengineering III
Davor Pavuna; Ivan Bozovic, Editor(s)

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