Disorder-induced superconductor to insulator transition and finite phase stiffness in two-dimensional phase-glass models

Enzo Granato

doi:10.1103/PhysRevB.102.184503

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Disorder-induced superconductor to insulator transition and finite phase stiffness in two-dimensional phase-glass models

Enzo Granato

DOI 10.1103/PhysRevB.102.184503 · Physical Review B

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Abstract

We study numerically the superconductor to insulator transition in two-dimensional phase-glass (or chiral-glass) models with varying degree of disorder. These models describe the effects of gauge disorder in superconductors due to random negative Josephson-junction couplings, or π junctions. Two different models are considered, with binary and Gaussian distribution of quenched disorder, having nonzero mean. Monte Carlo simulations in the path-integral representation are used to determine the phase diagram and critical exponents. In addition to the usual superconducting and insulating phases, a chiral-glass phase occurs for sufficiently large disorder, with random local circulating currents of different chiralities. A transition from superconductor to insulator can take place via the intermediate chiral-glass phase. We find, however, that the chiral-glass state has a finite phase stiffness, being still a superconductor, instead of the Bose metal, which has been suggested by mean-field theory.