Experimental Study of Positionally Disordered Josephson Junctions Arrays

Details Experimental Study of Positionally Disordered Josephson Junctions Arrays Experimental Study of Positionally Disordered Josephson Junctions Arrays

2005-09-06

arxiv.org/abs/cond-mat/0509151v1

Europhys. Lett. 76, 271 (2006)

Physics

Condensed Matter

Superconductivity

9 pages, 5 figures, RevTex4

Scientific paper

10.1209/epl/i2006-10258-6

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.

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