Dynamic Measurement of Percolative Critical Exponents in Disordered Josephson Junction Arrays
A.-L. Eichenberger, J. Affolter, M. Willemin, M. Mombelli, H. Beck, P. Martinoli, S. E. Korshunov
DOI 10.1103/PhysRevLett.77.3905 · Physical Review Letters
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Abstract
The complex conductance G(ω) of site-diluted Josephson junction arrays close to the percolation threshold was measured over a wide range of frequencies ω. Well below Tc both the superfluid [ωImG] and dissipative [ReG] components are independent of ω below a critical frequency ωc, whereas G(ω)∝ω−u with u≈12 for ω>ωc. This is shown to reflect the crossover from a Euclidean regime (ω<ωc) dominated by phononlike modes of the phase system to a fractal regime (ω>ωc), where the relevant excitations are localized fractons. Percolative critical exponents extracted from the data are consistent with theoretical predictions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Cu 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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