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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/13918

Title: Dual flux-to-voltage response of YBa2Cu3O7−δ asymmetric parallel arrays of Josephson junctions
Authors: Chesca, Boris
John, Daniel
Mellor, Christopher
Issue Date: 2014
Publisher: © Institute of Physics
Citation: CHESCA, B., JOHN, D. and MELLOR, C., 2014. Dual flux-to-voltage response of YBa2Cu3O7−δ asymmetric parallel arrays of Josephson junctions. Superconductor Science and Technology, 27 (5), article no. 055019,
Abstract: We fabricated a parallel array of 440 YBa2Cu3O7−δ bicrystal grain boundary Josephson junctions having an inductive asymmetric loop configuration within the array. Families of current–voltage characteristics (IVCs) have been measured in the temperature range (4.7–92) K for various values of a magnetic flux applied via a control current Ictrl. For both positive and negative current biases, I current-driven chains of magnetic vortices are propagating along the array producing flux-flow current resonances on the IVCs. However, at 77 K and above, due to the system's inductive asymmetry the flux flow is suppressed (enhanced) for negative (positive) I. Consequently, the system shows a dual flux-to-voltage response. For negative I it operates like a flux-interferometer having a rather sinusoidal V (Ictrl) response. In contrast, for positive I the device's response V (Ictrl) remains periodic but highly non-sinusoidal due to the interplay between multiple flux-flow modes. Below 60 K such a dual behaviour is far less pronounced as a result of flux-flow modes being suppressed due to a decrease of the dissipation coefficient with temperature.
Description: This paper has been accepted for publication in the journal, Superconductor Science and Technology [© IOP] and the definitive version is available at: http://dx.doi.org/10.1088/0953-2048/27/5/055019
Version: Accepted for publication
DOI: 10.1088/0953-2048/27/5/055019
URI: https://dspace.lboro.ac.uk/2134/13918
Publisher Link: http://dx.doi.org/10.1088/0953-2048/27/5/055019
ISSN: 0953-2048
Appears in Collections:Published Articles (Physics)

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