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arXiv · 0805.1356

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

B. Sacepe·C. Chapelier·T. I. Baturina·V. M. Vinokur·M. R. Baklanov·M. Sanquer
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Abstract

Scanning tunneling spectroscopy at very low temperature on homogeneously disordered superconducting Titanium Nitride thin films reveals strong spatial inhomogeneities of the superconducting gap $Δ$ 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 $Δ$, and growth of the $Δ/T_c$ ratio. These findings suggest that local superconductivity survives across the disorder-driven superconductor-insulator transition.

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B. Sacepe, C. Chapelier, T. I. Baturina, V. M. Vinokur, M. R. Baklanov, M. Sanquer. 2008-09-22. Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition. https://doi.org/10.1103/physrevlett.101.157006

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