Abstract
Scanning tunneling spectroscopy at very low temperatures on homogeneously disordered superconducting titanium nitride thin films reveals strong spatial inhomogeneities of the superconducting gap in the density of states. Upon increasing disorder, we observe suppression of the superconducting critical temperature towards zero, enhancement of spatial fluctuations in , and growth of the ratio. These findings suggest that local superconductivity survives across the disorder-driven superconductor-insulator transition.
- Received 9 May 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.157006
©2008 American Physical Society