Evidence of Vortices on the Insulating Side of the Superconductor-Insulator Transition

Abstract

The magnetoresistance of ultrathin insulating films of Bi has been studied with magnetic fields applied parallel and perpendicular to the plane of the sample. Deep in the strongly localized regime, the magnetoresistance is negative and independent of field orientation. As film thicknesses increase, the magnetoresistance becomes positive, and a difference between values measured in perpendicular and parallel fields appears, which is a linear function of the magnetic field and is positive. This is not consistent with the quantum interference picture. We suggest that it is due to vortices present on the insulating side of the superconductor-insulator transition.

arXiv comment4 pages, 3 figures

References in corpus (2)

• The superconductor-insulator transition in 2D dirty boson systems
• Magneto-Conductance Anisotropy and Interference Effects in Variable Range Hopping

Cited by in corpus (18)

• Superconductivity-Related Insulating Behavior
• Thickness-Magnetic Field Phase Diagram at the Superconductor-Insulator Transition in 2D
• Evidence for pairing above Tc from the dispersion in the pseudogap phase of cuprates
• Superconductivity in the insulating phase above the field-tuned superconductor-insulator transition in disordered indium oxide films
• Survival of superconducting correlations across the 2D superconductor-insulator transition: A finite frequency study
• True Superconductivity in a 2D "Superconducting-Insulating" System
• Anomalous magnetoresistance in the spinel superconductor LiTi2O4
• Disordered ultracold atomic gases in optical lattices: A case study of Fermi-Bose mixtures
• Evidence of Collective Charge Behavior in the Insulating State of Ultrathin Films of Superconducting Metals
• Nernst effect as a probe of superconducting fluctuations in disordered thin films
• Observation of Critical Amplitude Fluctuations near the Two Dimensional Superconductor-Insulator Transition
• Low temperature vortex liquid states induced by quantum fluctuations in the quasi two dimensional organic superconductor kappa-(BEDT-TTF)_{2} Cu(NCS)_{2}
• Magnetic Field Tuned Quantum Phase Transition in the Insulating Regime of Ultrathin Amorphous Bi Films
• Power law resistivity behavior in 2D superconductors across the magnetic-field tuned superconductor-insulator transition
• Anomalous Parallel Field Negative Magnetoresistance in Ultrathin Films Near the Superconductor-Insulator Transition
• Unusual giant magnetoresistance effect in heterojunction structure of ultra-thin single-crystal Pb film on silicon substrate
• Magnetic Flux Periodic Response of Nano-perforated Ultrathin Superconducting Films
• Possible robust insulator-superconductor transition on solid inert gas and other substrates