Magnetic-flux dependence of the resistive transition in a square Josephson-junction array

Journal Article · Fri Jul 01 00:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.63· OSTI ID:6988531

Carini, J P

We report measurements of the resistive behavior as a function of the perpendicular magnetic flux in a square proximity-coupled Josephson-junction array. The array was made by a novel ion-beam sputtering technique using the University of Chicago scanning ion microscope. The magnetic flux produces a uniform frustration of phase ordering between the superconducting islands in the array. We have measured both the Ohmic and non-Ohmic resistances as a function of temperature at several values of the frustration index f = phi/phi/sub 0/, the ratio of the applied flux phi to the superconducting flux quantum phi/sub 0/ = hc/2e. We compare the resistive transitions in the array with no frustration at f = 0 and f = 1, with weak frustration at f = 0.05, with commensurate frustration at f = (1/2, and with incommensurate frustration at f = 1-1/tau and at f = 1/tau (tau = (1+ ..sqrt..5 )/2, the golden ratio). We find that the transitions at both f = 0 and f = 1 resemble the Kosterlitz-Thouless transition of a two-dimensional superfluid. The transition at f = 0.05 is much broader and is not described by the Kosterlitz-Thouless theory. Instead, the resistance has a pinned flux-flow behavior at low temperatures. The transitions at f = (1/2 and the irrational frustrations are similar to each other but different from the unfrustrated transitions, a result which differs from the expectations of arguments based on the ground-state properties of the array for those fluxes. Our data support the idea that some type of freezing occurs for incommensurate frustration; however, we did not observe the hysteretic effects one might expect to see when cooling and heating through a glass transition.

• Research Organization: Department of Physics and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637
• OSTI ID: 6988531
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 38:1
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
JOSEPHSON JUNCTIONS
ELECTRIC CONDUCTIVITY
MAGNETIC FIELDS
ION BEAMS
PHASE TRANSFORMATIONS
SPUTTERING
TEMPERATURE DEPENDENCE
BEAMS
ELECTRICAL PROPERTIES
JUNCTIONS
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
656100* - Condensed Matter Physics- Superconductivity