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Proceedings Paper

Cooperative behavior and manifestation of dimensional crossover in SISIS-type Nb-based structures
Author(s): Ivan P. Nevirkovets; J. E. Evetts; Mark G. Blamire
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Paper Abstract

We have fabricated and investigated three-terminal Nb/Al-AlOx-Nb/Al-AlOx-Nb tunnel devices with a thin (approximately equals 13 nm) Nb/Al middle layer. By measuring I-V characteristics and Ic vs. H dependences of the whole device and particular junctions separately, we have demonstrated strong interaction between the junctions. As a result, at V equals 0 the system behaves like a single junction. The pronounced feature of this state is the critical current locking of the junctions, with a `common' critical current larger than the critical currents of the individual junctions. This state can be characterized by identical phase difference distributions for both junctions, and is stable at least for the region of superconducting current and magnetic field values corresponding to the first period of the diffraction pattern of the whole structure. At V equals 0 and some value of magnetic field near to that where critical current of the system first falls to zero, the system undergoes a transition into the 2D state, in which the individual junctions have different phase distributions and behave relatively independently. In a high magnetic field, when many vortices enter the multilayer structure, along with the current locking, there is evidence of phase locking.

Paper Details

Date Published: 29 June 1994
PDF: 10 pages
Proc. SPIE 2157, Superconducting Superlattices and Multilayers, (29 June 1994); doi: 10.1117/12.179174
Show Author Affiliations
Ivan P. Nevirkovets, Univ. of Cambridge (United Kingdom)
J. E. Evetts, Univ. of Cambridge (United Kingdom)
Mark G. Blamire, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 2157:
Superconducting Superlattices and Multilayers
Ivan Bozovic, Editor(s)

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