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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/1563

Title: Higher harmonics of ac voltage response in narrow strips of YBa2Cu3O7 thin films: evidence for strong thermal fluctuations
Authors: Ossandon, J.G.
Sergeenkov, S.
Esquinazi, P.
Kempa, H.
Keywords: nonlinear current response
superconducting films
Issue Date: Mar-2005
Publisher: IOP Publishing Ltd
Citation: Superconductor Science & Technology 18 (3): 325-329
Abstract: We report on measurements of higher harmonics of the ac voltage response in strips of YBa2Cu3O7-delta thin films as a function of temperature, frequency and ac current amplitude. The third (fifth) harmonic of the local voltage is found to exhibit a negative (positive) peak at the superconducting transition temperature and their amplitudes are closely related to the slope (derivative) of the first (ohmic) harmonic. The peaks practically do not depend on frequency and no even (second Or fourth) harmonics are detected. The observed data can be interpreted in terms of ac current induced thermal modulation of the sample temperature added to strong thermally activated fluctuations in the transition region.
Description: Ossandon, J.G. (reprint author). Department of Engineering Sciences, Universidad de Talca, Curicó, Chile.
URI: http://dspace.utalca.cl/handle/1950/1563
ISSN: 0953-2048
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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