Universal resistance capacitance crossover in current-voltage characteristics for unshunted array of overdamped Nb- AlO<inf>x</inf>-Nb Josephson junctions

S. Sergeenkov, V. A.G. Rivera, E. Marega, F. M. Araujo-Moreira

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Abstract

We report on some unusual behavior of the measured current-voltage characteristics (CVC) in artificially prepared two-dimensional unshunted array of overdamped Nb- AlOx -Nb Josephson junctions. The obtained nonlinear CVC are found to exhibit a pronounced (and practically temperature independent) crossover at some current Icr = (1/2 ΒC-1) I C from a resistance R dominated state with VR =R I 2 - IC2 below Icr to a capacitance C dominated state with VC = /4eC I-IC above Icr. The origin of the observed behavior is discussed within a single-plaquette approximation assuming the conventional resistively shunted junction model with a finite capacitance and the Ambegaokar-Baratoff relation for the critical current of the single junction. © 2010 American Institute of Physics.
Original languageAmerican English
JournalJournal of Applied Physics
DOIs
StatePublished - 1 May 2010
Externally publishedYes

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