Vortex-glass transition in superconducting Nb/Cu superlattices

TL;DR

This paper investigates the vortex-glass transition in Nb/Cu superconducting superlattices, revealing how the transition dimensionality depends on the superconducting coupling regime, with implications for understanding layered superconductor behavior.

Contribution

It demonstrates the dimensionality dependence of the vortex-glass transition in Nb/Cu superlattices based on coupling regimes, a novel insight into layered superconductor physics.

Findings

Vortex glass transition exhibits 2D behavior in decoupled superlattices.

Quasi-2D behavior observed in coupled superlattices.

Critical exponents are similar to those in high-temperature superconductors.

Abstract

Nb/Cu superconducting superlattices have been fabricated by dc magnetron sputtering. This system shows a vortex glass transition with critical exponents similar to high temperatures superconductors exponents. The transition dymensionality is governed by the superconducting coupling regime. The vortex glass transition shows a pure two dimensional behavior in decoupled superlattices and a quasi-two dimensional behavior in the superlattice coupling regime.