Physics – Condensed Matter – Superconductivity
Scientific paper
2009-04-14
Europhys. Lett., 85 (2009) 67005
Physics
Condensed Matter
Superconductivity
6 pages, 5 figures
Scientific paper
10.1209/0295-5075/85/67005
The modulation with magnetic field of the sheet inductance measured on proximity effect Josephson-junction arrays (JJAs) is progressively vanishing on lowering the temperature, leading to a low temperature field-independent response. This behaviour is consistent with the decrease of the two-dimensional penetration length below the lattice parameter. Low temperature data are quantitatively compared with theoretical predictions based on the XY model in absence of thermal fluctuations. The results show that the description of a JJA within the XY model is incomplete and the system is put well beyond the weak screening limit which is usually assumed in order to invoke the well known frustrated XY model describing classical Josephson-junction arrays.
Tesei Mauro
Theron Ricardo
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