Volume 85, Number 6, March 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 April 2009|
Magnetic screening in proximity effect Josephson-junction arrays
The Blackett Laboratory, Imperial College - London SW7 2BZ, UK, EU
2 Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Microengineering IMT, Photovoltaics and thin film electronics laboratory - Neuchâtel, Switzerland
Accepted: 2 March 2009
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 the 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.
PACS: 74.81.Fa – Josephson junction arrays and wire networks / 74.25.Ha – Magnetic properties / 64.60.De – Statistical mechanics of model systems (Ising model, Potts model, field-theory models, Monte Carlo techniques, etc.)
© EPLA, 2009
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