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.
@article{arxiv.1806.01335,
title = {Magnetic field-tuned superconductor/insulator transition in TiN nanostrips},
author = {I. Schneider and K. Kronfeldner and T. I. Baturina and C. Strunk},
journal= {arXiv preprint arXiv:1806.01335},
year = {2019}
}