Effect of Coulomb interactions on the disorder-driven superconductor-insulator transition

Daniel Sherman, Boris Gorshunov, Shachaf Poran, Nandini Trivedi, Eli Farber, Martin Dressel, and Aviad Frydman
Phys. Rev. B 89, 035149 – Published 31 January 2014

Abstract

We have studied the evolution of the superconducting energy gap of indium oxide through the disorder-driven superconductor-to-insulator transition (SIT) using two distinct experimental methods that allow us to test the influence of metallic screening: tunneling spectroscopy in which a metallic electrode is adjacent to the studied sample, thus screening Coulomb interactions, and contactless terahertz spectroscopy which probes the unperturbed sample. The tunneling measurements reveal a similar superconducting gap on both sides of the SIT and at temperatures above and below Tc. Terahertz measurements detect the superconducting gap below but not above the critical temperature nor in the insulating state. This difference between the two spectroscopy methods is attributed to the effect of Coulomb interactions which are screened in the tunneling experiments. Our study reveals the importance of Coulomb interactions on the energy gap of disordered superconductors.

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  • Received 25 August 2013
  • Revised 13 January 2014
  • Corrected 26 November 2014

DOI:https://doi.org/10.1103/PhysRevB.89.035149

©2014 American Physical Society

Corrections

26 November 2014

Erratum

Publisher's Note: Effect of Coulomb interactions on the disorder-driven superconductor-insulator transition [Phys. Rev. B 89, 035149 (2014)]

Daniel Sherman, Boris Gorshunov, Shachaf Poran, Nandini Trivedi, Eli Farber, Martin Dressel, and Aviad Frydman
Phys. Rev. B 90, 239902 (2014)

Authors & Affiliations

Daniel Sherman1,2, Boris Gorshunov1,3,4, Shachaf Poran2, Nandini Trivedi5, Eli Farber6, Martin Dressel1, and Aviad Frydman2

  • 1Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
  • 2Department of Physics, Bar Ilan University, Ramat Gan 52900, Israel
  • 3Prokhorov Institute of General Physics, Russian Academy of Sciences, Vavilov Street 38, 119991 Moscow, Russia
  • 4Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Moscow Region, Russia
  • 5Department of Physics, Ohio State University, 191 W. Woodruff Avenue, Columbus, Ohio 43210, USA
  • 6Laboratory for Superconductivity and Optical Spectroscopy, Ariel University, Ariel 40700

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Issue

Vol. 89, Iss. 3 — 15 January 2014

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