Vortex dynamics and states of artificially layered superconducting films with correlated defects

Details Vortex dynamics and states of artificially layered superconducting films with correlated defects Vortex dynamics and states of artificially layered superconducting films with correlated defects

2002-04-16

arxiv.org/abs/cond-mat/0204342v1

Phys. Rev. B 66 (2002) 184505

Physics

Condensed Matter

Superconductivity

16 pages, 10 figures, 3 tables

Scientific paper

10.1103/PhysRevB.66.184505

Linear resistances and $IV$-characteristics have been measured over a wide range in the parameter space of the mixed phase of multilayered a-TaGe/Ge films. Three films with varying interlayer coupling and correlated defects oriented at an angle $\approx 25$ from the film normal were investigated. Experimental data were analyzed within vortex glass models and a second order phase transition from a resistive vortex liquid to a pinned glass phase. Various vortex phases including changes from three to two dimensional behavior depending on anisotropy have been identified. Careful analysis of $IV$-characteristics in the glass phases revealed a distinctive $T$ and $H$-dependence of the glass exponent $\mu$. The vortex dynamics in the Bose-glass phase does not follow the predicted behavior for excitations of vortex kinks or loops.

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