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Robust pseudogap across the magnetic field driven superconductor to insulator-like transition in strongly disordered NbN films

  • Indranil RoyEmail author
  • Rini Ganguly
  • Harkirat Singh
  • Pratap Raychaudhuri
Regular Article
  • 95 Downloads

Abstract

We investigate the magnetic field evolution of the superconducting state in a strongly disordered NbN thin film which exhibits a magnetic field tuned superconductor to insulator-like transition, employing low temperature scanning tunneling spectroscopy (STS). Transport measurements of the sample reveals a characteristic magnetic field, which separates the low field state where resistance decreases with decreasing temperature, i.e. dR/dT > 0 and a high-field state where dR/dT < 0. However, STS imaging of the superconducting state reveals a smooth evolution across this field and the presence of a robust pseudogap on both sides of this characteristic field. Our results suggest that the superconductor-insulator transition might be a percolative transition driven by the shrinking of superconducting fraction with magnetic field.

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Keywords

Solid State and Materials 

Supplementary material

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Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Tata Institute of Fundamental ResearchColaba, MumbaiIndia
  2. 2.Department of PhysicsNational Institute of TechnologyHazratbal, SrinagarIndia

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