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Robust pseudogap across the magnetic field driven superconductor to insulator-like transition in strongly disordered NbN films
- Source :
- Eur. Phys. J. B (2019) 92: 49
- Publication Year :
- 2019
-
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.<br />Comment: 22 pages, 8 figures including supplementary material
Details
- Database :
- arXiv
- Journal :
- Eur. Phys. J. B (2019) 92: 49
- Publication Type :
- Report
- Accession number :
- edsarx.1909.10071
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1140/epjb/e2019-90488-0