THE THERMAL-ASSISTED-FLUX-FLOW EFFECT IN INFINITE LENGTH RECTANGLE-SECTION SAMPLE OF PB-DOPED HGBA2CA2CU3O8+DELTA

The theory of thermal-assisted-flux flow in an infinite length specime n of superconductor, with rectangle cross-section, is discussed by usi ng somewhat different in the mathematical method rather than the conve ntional one. The formalism is also extended to the one-dimensional cas e. The results of our formalism are consistent with that obtained by K es et al. The pinning potential and the crossover from TAFF to Flux Cr eep regime for the Pb-doped mercury copper oxide superconductor with n ominal composition of Hg0.69Pb0.31Ba2Ca2CU3O8+delta were studied exper imentally by means of ac magnetic susceptibility responses with a bias of de field parallels to the longitudinal axis of the sample.