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arXiv · 1806.01335

Magnetic field-tuned superconductor/insulator transition in TiN nanostrips

I. Schneider·K. Kronfeldner·T. I. Baturina·C. Strunk
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Abstract

We have measured the electric transport properties of TiN nanostrips with different widths. At zero magnetic field the temperature dependent resistance R(T) saturates at a finite resistance towards low temperatures, which results from quantum phase slips in the narrower strips. We find that the current-voltage (I-V) characteristics of the narrowest strips are equivalent to those of small Josephson junctions. Applying a transverse magnetic field drives the devices into a reentrant insulating phase, with I-V-characteristics dual to those in the superconducting regime. The results evidence that our critically disordered superconducting nanostrips behave like small self-organized random Josephson networks.

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I. Schneider, K. Kronfeldner, T. I. Baturina, C. Strunk. 2018-06-04. Magnetic field-tuned superconductor/insulator transition in TiN nanostrips. https://doi.org/10.1103/physrevb.99.094522

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