Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition

Details Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition

2008-05-09

arxiv.org/abs/0805.1356v2

Phys. Rev. Lett. 101, 157006 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures. Minor changes. Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.157006

Scanning tunneling spectroscopy at very low temperature on homogeneously disordered superconducting Titanium Nitride thin films reveals strong spatial inhomogeneities of the superconducting gap $\Delta$ in the density of states. Upon increasing disorder, we observe suppression of the superconducting critical temperature $T_c$ towards zero, enhancement of spatial fluctuations in $\Delta$, and growth of the $\Delta/T_c$ ratio. These findings suggest that local superconductivity survives across the disorder-driven superconductor-insulator transition.

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