AC Susceptibility of YBCO 1:2:3 Films on Silver Substrates

Abstract

The YBa2Cu3O δ lms were obtained directly on silver substrates by the sedimentation processes. The thicknesses of these lms are of the order of several tens µ. The temperature dependences of the AC susceptibility of the lms were measured and analyzed. The critical temperatures of these specimens obtained from the dispersion part of AC susceptibility vary from 89.2 K to 92.5 K. The critical currents were calculated from the absorption part of AC susceptibility using the Bean model. The temperature dependences of the critical currents were tted using the GinzburgLandau strong coupling limit approach.

Critical Currents of (Bi1−x Pb x )2Sr2Ca2Cu3O y (x = 0.2 and 0.4) Films Deposited on Silver Substrate by Sedimentation

“…The temperature dependencies of the critical current densities of all the samples were fitted using (2) with the two fit parameters: J c0 and n. The values of T cJ , were taken from the experiment. Fits of (2) to the experimental data are [19,20] and bismuth 1G superconducting tape [21]. All the samples have the value of the exponent greater than unity, which suggest a strong pinning forces.…”