Regime Interpretation of Anomalous Vortex Dynamics in 2D Superconductors

Low-frequency dynamic impedance [σ−1(ω,T)≡(σ1+iσ2)−1] measurements on Josephson junction arrays found that σ1∼|lnω|, σ2∼const. This implies anomalously sluggish vortex mobilities μV(ω)∼σ−11, and is in conflict with general dynamical scaling expressions. We calculate (a) σ(ω,T) by real-space vortex scaling and (b) μV(ω) using Mori's formalism for a screened Coulomb gas. We find, in addition to the usual critical (large-ω) and hydrodynamic (low-ω) regimes, a new intermediate-frequency scaling regime into which the experimental data fall. This resolves the above mentioned conflict and makes explicit predictions for the scaling form of σ(ω,T).


Published in:
Physical Review Letters, 78, 3, 523-526
Year:
1997
Publisher:
American Physical Society
ISSN:
0031-9007
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2015-04-01, last modified 2018-09-13

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