Activation Energy for Vortex Motion in Anisotropic Superconductors

M.F. LAGUNA, E.A. JAGLA, AND C.A. BALSEIRO

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

The American Physical Society

Lugar: U.S.A.; Año: 1998 vol. 57 p. 10884 - 10888

0163-1829

We study the transport properties of highly anisotropic superconductors with different kinds of topological disorder using Josephson-junction networks. The model describes a stack of weakly coupled superconducting planes in the presence of an external magnetic field perpendicular to them. At low temperatures the resistivities for current flowing perpendicularly and parallel to the external field show a thermally activated behavior. For systems with point defects, the activation energy is the same for the two components of the resistivity, while in systems with columnar defects they may be different. The results are interpreted in terms of a simple model and compared with experimental results.