Abstract
The theory of thermal-assisted-flux flow in an infinite length specimen of superconductor, with rectangle cross-section, is discussed by using somewhat different in the mathematical method rather than the conventional one. The formalism is also extended to the one-dimensional case. The results of our formalism are consistent with that obtained by Kes et al. The pinning potential and the crossover from TAFF to Flux Creep regime for the Pb-doped mercury copper oxide superconductor with nominal composition of Hg0.69Pb0.31Ba2Ca2Cu3O8+δ were studied experimentally by means of ac magnetic susceptibility responses with a bias of dc field parallels to the longitudinal axis of the sample.
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