Volume 76, Number 2, October 2006
|Page(s)||271 - 277|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||13 September 2006|
Experimental study of positionally disordered Josephson junction arrays
Department of Physics and Institute of Basic Science, Sungkyunkwan University Suwon 440-746, Republic of Korea
Corresponding author: email@example.com
Accepted: 24 August 2006
We experimentally studied the effect of positional disorder on a Josephson junction array. This system provides an experimental realization of a two-dimensional XY model with random phase shifts. Contrary to many earlier numerical and analytical investigations, the results demonstrate that finite-temperature superconductivity is never eliminated by positional disorder. As disorder strength increased, the Kosterltz-Thouless (KT) type low-temperature order changed to a non-KT-type order with long-range phase coherence, persisting even during the maximal disorder limit. A possible finite-temperature glass transition is discussed.
PACS: 64.60.Cn – Order-disorder transformations; statistical mechanics of model systems / 75.50.Lk – Spin glasses and other random magnets / 74.25.Qt – Vortex lattices, flux pinning, flux creep
© EDP Sciences, 2006
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