Positional disorder in Josephson-junction arrays: Experiments and simulations

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.5966· OSTI ID:5435965

Forrester, M G; Lee, H J; Tinkham, M; Lobb, C J

We present the results of measurements on proximity-effect arrays with deliberate positional disorder, characterized by a parameter ..delta../sup */. This system provides an experimental realization of XY magnet with random Dzyaloshinskii-Moriya interactions. In measurements of resistance versus perpendicular magnetic field, R(f/sub 0/), we find strong evidence for a critical field f/sub c/proportional1/..delta../sup */ beyond which phase coherence is destroyed. Our Monte Carlo simulations show evidence for reentrant behavior in the helicity modulus Y, but with Y always finite at the lowest temperatures. Such a critical field and reentrance were predicted by Granato and Kosterlitz.

• Research Organization: Department of Physics and Division of Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
• OSTI ID: 5435965
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL FIELD
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FIELDS
MONTE CARLO METHOD
PHYSICAL PROPERTIES
PROXIMITY EFFECT
SIMULATION
SUPERCONDUCTING JUNCTIONS