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We have measured the electric transport properties of TiN nanostrips withdifferent widths. At zero magnetic field the temperature dependent resistanceR(T) saturates at a finite resistance towards low temperatures, which resultsfrom quantum phase slips in the narrower strips. We find that thecurrent-voltage (I-V) characteristics of the narrowest strips are equivalent tothose of small Josephson junctions. Applying a transverse magnetic field drivesthe devices into a reentrant insulating phase, with I-V-characteristics dual tothose in the superconducting regime. The results evidence that our criticallydisordered superconducting nanostrips behave like small self-organized randomJosephson networks.

Magnetic field-tuned superconductor/insulator transition in TiN nanostrips