Superconducting-insulator transition in disordered Josephson junctions networks

Abstract

The superconducting-insulator transition is simulated in disordered networks of Josephson junctions with thermally activated Arrhenius-like resistive shunt. By solving the conductance matrix of the network, the transition is reproduced in different experimental conditions by tuning thickness, charge density and disorder degree. In particular, on increasing fluctuations of the parameters entering the Josephson coupling and the Coulomb energy of the junctions, the transition occurs for decreasing values of the critical temperature Tc and increasing values of the activation temperature To. The results of the simulation compare well with recent experiments where the mesoscopic fluctuations of the phase have been suggested as the mechanism underlying the phenomenon of emergent granularity in otherwise homogeneous films. The proposed approach is compared with the results obtained on TiN films and nanopatterned arrays of weak-links, where the superconductor-insulator transition is directly stimulated.

References in corpus (10)

• Nature of the superconductor-insulator transition in disordered superconductors
• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Localized Superconductivity in the Quantum-Critical Region of the Disorder-Driven Superconductor-Insulator Transition in TiN Thin Films
• Indirect electric field doping of the CuO2 planes of the cuprate NdBa2Cu3O7 superconductor
• Superconducting quantum phase transitions tuned by magnetic impurity and magnetic field in ultrathin a-Pb films
• Island formation in disordered superconducting thin films at finite magnetic fields
• Evidence of Spatially Inhomogeous Pairing on the Insulating Side of a Disorder-Tuned Superconductor-Insulator Transition
• The Emerging Energy Web
• Resistive transition in disordered superconductors with varying intergrain coupling
• Superconducting-insulator transition in disordered Josephson junctions networks

Cited by in corpus (1)

• Superconducting-insulator transition in disordered Josephson junctions networks