Experimental Study of Positionally Disordered Josephson Junctions Arrays

TL;DR

This experimental study investigates how positional disorder affects Josephson junction arrays, revealing that low-temperature superconductivity persists and transitions to long-range order despite increasing disorder, challenging previous numerical predictions.

Contribution

It provides experimental evidence that positional disorder does not destroy superconductivity and induces a transition to long-range order in Josephson junction arrays.

Findings

Superconductivity persists despite high positional disorder.

Transition from KT to non-KT order with increasing disorder.

Long-range phase coherence remains at maximal disorder.

Abstract

We experimentally studied the effect of positional disorder on a Josephson junction array with $f = n$, ${1/2} + n$, or ${2/5} + n$ flux quanta per unit cell for integral $n$. This system provides an experimental realization of a two-dimensional XY model with random phase shifts. Contrary to many earlier numerical and analytical investigations, our results suggest that low-temperature superconductivity is never destroyed by positional disorder. As the disorder strength increased, the Kosterltz-Thouless (KT) type order in the $f = 0$ and 1/2 systems changed to a non-KT type order with a long-range phase coherence, which persisted even in the maximal disorder limit. A possible finite-temperature glass transition is discussed.