Phase-coherence threshold and vortex-glass state in diluted Josephson-junction arrays in a magnetic field
Enzo Granato, Daniel Domínguez
DOI 10.1103/PhysRevB.63.094507 · Physical Review B
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Abstract
We study numerically the interplay of phase coherence and vortex-glass state in two-dimensional Josephson-junction arrays with average rational values of flux quantum per plaquette f and random dilution of junctions. For f=1/2, we find evidence of a phase-coherence threshold value xs, below the percolation concentration of diluted junctions xp, where the superconducting transition vanishes. For xs<x<xp the array behaves as a zero-temperature vortex glass with nonzero linear resistance at finite temperatures. The zero-temperature critical currents are insensitive to variations in f in the vortex glass region while they are strongly f dependent in the phase-coherent region.
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