Superconducting transition of a two-dimensional Josephson junction array in weak magnetic fields

Abstract

The superconducting transition of a two-dimensional (2D) Josephson junction array exposed to weak magnetic fields has been studied experimentally. Resistance measurements reveal a superconducting-resistive phase boundary in serious disagreement with the theoretical and numerical expectations. Critical scaling analyses of the $IV$ characteristics indicate contrary to the expectations that the superconducting-to-resistive transition in weak magnetic fields is associated with a melting transition of magnetic-field-induced vortices directly from a pinned-solid phase to a liquid phase. The expected depinning transition of vortices from a pinned-solid phase to an intermediate floating-solid phase was not observed. We discuss effects of the disorder-induced random pinning potential on phase transitions of vortices in a 2D Josephson junction array.

9 pages, 7 figures (EPS+JPG format), RevTeX4

References in corpus (3)

• Dynamic Scaling and Two-Dimensional High-Tc Superconductors
• Critical Behavior of Frustrated Josephson Junction Arrays with Bond Disorder
• Normal-Superconducting Phase Transition Mimicked by Current Noise

Cited by in corpus (8)

• Phase Transition and Critical Dynamics in Diluted Josephson Junction Arrays
• Experimental Study of Positionally Disordered Josephson Junctions Arrays
• Anomalous Nernst effect and heat transport by vortex vacancies in granular superconductors
• Fate of global superconductivity in arrays of long SNS junctions
• Long-Range Order of Vortex Lattices Pinned by Point Defects in Layered Superconductors
• Influence of vortices and phase fluctuations on thermoelectric transport properties of superconductors in a magnetic field
• Multidimensional Washboard Ratchet Potentials for Frustrated Two-Dimensional Josephson-Junctions Arrays on square lattices
• Superconducting phase transitions in frustrated Josephson-junction arrays on a dice lattice