Regime Interpretation of Anomalous Vortex Dynamics in 2D Superconductors
- Institut de Physique, Universite de Neuchatel, Rue A.L. Breguet 1, 2000 Neuchatel (Switzerland)
- Condensed Matter Physics Group, International Centre for Theoretical Physics, 34100 Trieste (Italy)
Low-frequency dynamic impedance [{sigma}{sup -1}({omega},T){equivalent_to}({sigma}{sub 1}+i{sigma}{sub 2}){sup -1}] measurements on Josephson junction arrays found that {sigma}{sub 1}{approximately}{vert_bar}ln{omega}{vert_bar}, {sigma}{sub 2}{approximately}const. This implies anomalously sluggish vortex mobilities {mu}{sub V}({omega}){approximately}{sigma}{sup -1}{sub 1}, and is in conflict with general dynamical scaling expressions. We calculate (a) {sigma}({omega},T) by real-space vortex scaling and (b) {mu}{sub V}({omega}) using Mori{close_quote}s formalism for a screened Coulomb gas. We find, in addition to the usual critical (large-{omega}) and hydrodynamic (low-{omega}) 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 {sigma}({omega},T). {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 439084
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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