Order-disorder transition and the zero-dimensional vortex pinning regime in Bi2Sr2CaCu2O8+delta

CORREA, V.F.; HERBSOMMER, J.A.; KAUL, E.E.; DE LA CRUZ, F.; NIEVA, G.

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

American Physical Society

Año: 2001 vol. 63 p. 925021 - 925024

0163-1829

We make a comparative study between the ab plane´s dc critical current and the ac transverse magnetic permeability ì(perpendicular to) in the Campbell limit for optimally doped and overdoped Bi2Sr2CaCu2O8+delta samples. We focus attention on the low-temperature region [T/T-c(0) < 0.25], where the transition to the zero-dimensional Larkin limit is detected by the critical current as well as by a rapid change of the Labusch parameter with temperature. The order-disorder transition, characterized by the second peak in magnetization, disappears in the presence of this zero-dimensional pinning regime.