Cooperative behavior and manifestation of dimensional crossover in SISIS-type Nb-based structures

Ivan P. Nevirkovets*, J. E. Evetts, Mark G. Blamire

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We have fabricated and investigated three-terminal Nb/Al-AlOx-Nb/Al-AlOx-Nb tunnel devices with a thin (≈ 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 = 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 = 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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsIvan Bozovic
PublisherPubl by Society of Photo-Optical Instrumentation Engineers
Number of pages10
ISBN (Print)0819414522
StatePublished - Dec 1 1994
Externally publishedYes
EventSuperconducting Superlattices and Multilayers - Los Angeles, CA, USA
Duration: Jan 24 1994Jan 25 1994

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherSuperconducting Superlattices and Multilayers
CityLos Angeles, CA, USA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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