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Proceedings Paper

Influence of thermal annealing of MgO substrate on 1/f noise of YBaCuO superconducting thin films
Author(s): Gerard Leroy; Joel Gest; Lode K. J. Vandamme; Jean-Claude Carru; Annick F. Degardin; Alain J. Kreisler
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Paper Abstract

In this work, we have characterized YBaCuO high Tc superconducting thin films deposited on (001) MgO substrates and compared their noise properties. The films were sputtered on substrates which were annealed at different temperatures prior to deposition. The noise measurements were performed under the same conditions: 1) Without bias, the films are at equilibrium and exhibit only thermal noise proportional to the real part of the impedance for the voltage fluctuations or proportional to the real part of the admittance for the current fluctuations. 2) With bias, the films exhibit 1/f noise due to the conductivity fluctuations. The extra noise is compared with Hooge's empirical relation. The normalized noise spectral density (Sv / V2) measured at 300 K as a function of the substrate annealing temperature displays a bell-shaped dependence with a maximum at a critical temperature.

Paper Details

Date Published: 25 May 2004
PDF: 5 pages
Proc. SPIE 5469, Fluctuations and Noise in Materials, (25 May 2004); doi: 10.1117/12.546726
Show Author Affiliations
Gerard Leroy, Univ. du Littoral Cote d'Opale (France)
Joel Gest, Univ. du Littoral Cote d'Opale (France)
Lode K. J. Vandamme, Technische Univ. Eindhoven (Netherlands)
Jean-Claude Carru, Univ. du Littoral Cote d'Opale (France)
Annick F. Degardin, Ecole Superieure d'Electricite (France)
CNRS (France)
Alain J. Kreisler, Ecole Superieure d'Electricite (France)
CNRS (France)

Published in SPIE Proceedings Vol. 5469:
Fluctuations and Noise in Materials
Dragana Popovic; Michael B. Weissman; Zoltan A. Racz, Editor(s)

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