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Screening technique measurement of ac imaginary susceptibility and critical current density of YBa2Cu3O7-δ films

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4 Author(s)
Acosta, C.R. ; Depto. Fı´sica Aplicada, CINVESTAV-IPN, Unidad Mérida, A. P. 73 Cordemex, 97310 Mérida, Yucatán, México ; Acosta, M. ; Sosa, Victor ; Ares, O.

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The screening technique was used to study systematically the ac susceptibility of superconducting YBa2Cu3O7-δ thin films in the temperature range of 32–83 K. We used the Fourier transform of the pick-up signal, coming from the secondary coil, to estimate the critical current density. From the experimental data we observed regularities in the imaginary part of ac susceptibility, and confirmed that the flux creep mechanism is dominant. © 2000 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:87 ,  Issue: 5 )