Universal resistance capacitance crossover in current-voltage characteristics for unshunted array of overdamped Nb- AlOx-Nb Josephson junctions

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

doi:10.1063/1.3407566

Universal resistance capacitance crossover in current-voltage characteristics for unshunted array of overdamped Nb- AlO_x-Nb Josephson junctions

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

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

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 Icr = (1/2 Β_C-1) I _C from a resistance R dominated state with V_R =R I ² - I_C2 below Icr to a capacitance C dominated state with V_C = /4eC I-I_C 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.

Original language	English
Article number	096102
Journal	Journal of Applied Physics
Volume	107
Issue number	9
DOIs	https://doi.org/10.1063/1.3407566
State	Published - 1 May 2010

Bibliographical note

Funding Information:
We are indebted to R. S. Newrock, P. Barbara and C. J. Lobb for helpful discussions and for providing SIS samples. This work has been financially supported by the Brazilian agencies CNPq, CAPES, and FAPESP.

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10.1063/1.3407566

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title = "Universal resistance capacitance crossover in current-voltage characteristics for unshunted array of overdamped Nb- AlOx-Nb Josephson junctions",

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.",

author = "S. Sergeenkov and Rivera, {V. A.G.} and E. Marega and Araujo-Moreira, {F. M.}",

note = "Funding Information: We are indebted to R. S. Newrock, P. Barbara and C. J. Lobb for helpful discussions and for providing SIS samples. This work has been financially supported by the Brazilian agencies CNPq, CAPES, and FAPESP.",

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AU - Sergeenkov, S.

AU - Rivera, V. A.G.

AU - Marega, E.

AU - Araujo-Moreira, F. M.

N1 - Funding Information: We are indebted to R. S. Newrock, P. Barbara and C. J. Lobb for helpful discussions and for providing SIS samples. This work has been financially supported by the Brazilian agencies CNPq, CAPES, and FAPESP.

PY - 2010/5/1

Y1 - 2010/5/1

N2 - 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.

AB - 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.

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Universal resistance capacitance crossover in current-voltage characteristics for unshunted array of overdamped Nb- AlO_x-Nb Josephson junctions

Abstract

Bibliographical note

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