Physics – Condensed Matter – Superconductivity
Scientific paper
2010-08-26
Journal of Applied Physics 107, 096102 (2010)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1063/1.3407566
We report on some unusual behavior of the measured current-voltage characteristics (CVC) in artificially prepared two-dimensional unshunted array of overdamped Nb-AlO_x-Nb Josephson junctions. The obtained nonlinear CVC are found to exhibit a pronounced (and practically temperature independent) crossover at some current I_{cr}=\left(\frac{1}{2\beta_C}-1\right)I_C from a resistance R dominated state with V_R=R\sqrt{I^2-I_C^2} below I_{cr} to a capacitance C dominated state with V_C=\sqrt{\frac{\hbar}{4eC}} \sqrt{I-I_C} above I_{cr}. The origin of the observed behavior is discussed within a single-plaquette approximation assuming the conventional RSJ model with a finite capacitance and the Ambegaokar-Baratoff relation for the critical current of the single junction.
Araujo-Moreira Fernando M.
Marega E.
Rivera V. A. G.
Sergeenkov Sergei
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