Positional disorder in Josephson-junction arrays: Experiments and simulations
M. G. Forrester, Hu Jong Lee, M. Tinkham, C. J. Lobb
DOI 10.1103/PhysRevB.37.5966 · Physical Review B
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Abstract
We present the results of measurements on proximity-effect arrays with deliberate positional disorder, characterized by a parameter Δ*. This system provides an experimental realization of XY magnet with random Dzyaloshinskii-Moriya interactions. In measurements of resistance versus perpendicular magnetic field, R(f0), we find strong evidence for a critical field fc∝1/Δ* 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb0.95Bi0.05 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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