H. Pastoriza, A. Arribére, M. F. Goffman, F. de la Cruz, D. B. Mitzi, and A. Kapitulnik. "Evidence for the quasi-two dimensional behavior of the vortex structure in Bi$2$Sr$2$CaCu$_2$O8-? single crystals." Physica B 194-196 (1994): 2227–2228.
Abstract: AC susceptibility and dc magnetization measurements on Bi$2$Sr$2$CaCu$2Ο8$ (BSCCO) single crystals in a wide range of temperatures clearly show that below the dc irreversibility line the vortex system loss the long range order in the c direction. The susceptibility data taken at 7 Hz show the different nature of two dissipation peaks: One related to the interplane currents at temperatures well below the dc irreversibility line and the other associated with the intraplane ones at temperatures above that line. In this sense the irreversibility line corresponds to the temperature where quasi-two dimensional vortices are depinned.