Magnetic field-dependent inhomogeneities and their effect on the magnetoresponse of 2D superconductors

Abstract

We show that inhomogeneities in the spatial distribution of Cooper pairs and in the phase of the local superconducting order parameter in the vicinity of a superconductor-normal state transition (SNT) in two dimensions can be highly sensitive to a perpendicular magnetic field. We focus on the role of orbital effects in the field-dependence of local superfluid stiffness and superconducting phase disorder in homogeneously-disordered two-dimensional superconductor thin films. The relative importance of these orbital effects is analyzed in different physical regimes dominated by Coulomb blockade, thermal phase fluctuations and Aharanov-Bohm phase disorder respectively. Following this approach, we obtain explicit expressions for the field dependence of magnetoresistance and superfluid stiffness near the SNT, and attempt an understanding of some recent experimental findings.

8 pages, 3 figures

References in corpus (9)

• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Phase transition of one dimensional bosons with strong disorder
• Collective transport in the insulating state of Josephson junction arrays
• The insulating phases and superfluid-insulator transition of disordered boson chains
• Self Duality and a possible Hall-insulator phase near the superconductor-to-insulator transition in two-dimensional indium-oxide films
• Thermal transport in a granular metal array
• Disordered bosons in one dimension: from weak to strong randomness criticality
• Quantum Monte Carlo study of a magnetic-field-driven 2D superconductor-insulator transition
• Quantum phase transitions in two-dimensional systems

Cited by in corpus (2)

• Disordered BKT transition and superinsulation
• Quantum criticality and multiple crossing points in the magnetoresistance of thin TiN-films