Scale dependent superconductor-insulator transition

Abstract

We study the disorder driven superconductor to insulator transition in amorphous films of high carrier-concentration indium-oxide. Using thin films with various sizes and aspect ratios we show that the `critical' sheet-resistance $R_{\square }$ depends systematically on sample geometry; superconductivity disappears when $R_{\square }$ exceeds $\approx 6$k$\Omega$ in large samples. On the other hand, wide and sufficiently short samples of the same batch exhibit superconductivity (judged by conductivity versus temperature) up to $R_{\square }$ which is considerably larger. These results support the inhomogeneous scenario for the superconductor-insulator transition.

Contribution to the proceedings of "Fluctuations and phase transitions in superconductors", Nazareth Ilit, Israel, June 10-14, 2007

References in corpus (6)

• Eigenfunction fractality and pseudogap state near superconductor-insulator transition
• Superconductivity-Related Insulating Behavior
• Experimental evidence for a collective insulating state in two-dimensional superconductors
• Superconductivity in the insulating phase above the field-tuned superconductor-insulator transition in disordered indium oxide films
• Theory of Magneto-resistance of Disordered Superconducting Films
• Long-range potential fluctuations and 1/f noise in hydrogenated amorphous silicon

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• Reduced ITO for Transparent Superconducting Electronics
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• Specific Heat Signature of the Berezinskii-Kosterlitz-Thouless Transition in Ultrathin Superconducting Films
• Instability of insulators near quantum phase transitions
• Magnetoresistance Anisotropy in Amorphous Superconducting Thin Films: A Site-Bond Percolation Approach
• Enhancement of Superconductivity upon reduction of carrier density in proximitized graphene
• Universal Voltage Fluctuations in Disordered Superconductors
• Mean-field theory of first-order quantum superconductor-insulator transition
• Rare-Region Onset of Superconductivity in Granular Systems
• Superinsulator as a phase of bi-particle localized states
• Conductance Oscillations in a Topological Insulator-Disordered Superconductor Hybrid Interface