Abstract
An anomalously broad foot structure is observed in the zero-field resistive transition for the ab plane of Bi2Sr2CaCu2O8+y single crystals, which are found to have a high density of dislocations. However, this anomalous behavior is not apparent for resistive measurements along the c axis. The foot structure can be treated as a superposition of a long resistance tail and a dissipation peak, in which the long resistance tail obeys the theory of KT scaling behavior of resistivity. The dissipation peak is related to the fluxon transition in Josephson-coupled layered superconductors as detailed by Horovitz [Phys. Rev. Lett. 72, 1569 (1994)].