l/f noise peaks of YBa2Cu3O7–δ thin films in a magnetic field

H. El Hamidi, A. Taoufik, M. Boudhira, B. El Moudden, H. Alouadi, A. Hafid, A. Nafidi, M. Bghour, A. Tirbiyine

Abstract


The magnetic field and temperature dependence of l/f noise has been measured in epitaxial YBa2Cu3O7–δ thin films. In magnetic field two peaks were observed as temperature decreases; one at higher temperature was found to match the thermal fluctuation of the sample resistance and the other near the foot of the transition was found to be magnetic-field dependent and we have studied the voltage noise spectral density SV(f, T, H) dependence on frequency f, applied magnetic field H and temperature T.


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