| Issue |
Europhys. Lett.
Volume 76, Number 2, October 2006
|
|
|---|---|---|
| Page(s) | 271 - 277 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2006-10258-6 | |
| 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: mychoi@skku.edu
Received:
30
March
2006
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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