1/ω Flux Noise and Dynamical Critical Properties of Two-DimensionalXYModels
| Autor: | Paul H. E. Tiesinga, J. E. van Himbergen, T. J. Hagenaars, Jorge V. José |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Superconductivity
Physics Josephson effect Condensed matter physics Thermodynamic equilibrium Condensed Matter - Superconductivity General Physics and Astronomy Flux 01 natural sciences Omega 010305 fluids & plasmas Condensed Matter::Superconductivity 0103 physical sciences Ginzburg–Landau theory 010306 general physics Critical exponent Condensed Matter - Statistical Mechanics Noise (radio) |
| Zdroj: | Physical Review Letters. 78:519-522 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.78.519 |
| Popis: | We have numerically studied the dynamic correlation functions in thermodynamic equilibrium of two-dimensional O(2)-symmetry models with either bond (RSJ) or site (TDGL) dissipation as a function of temperature T. We find that above the critical temperature the frequency dependent flux noise $S_{\Phi}(\omega)\sim \vert 1+ {(\omega/\Omega)}^2\vert^{-\alpha (T)/2}$, with $0.85\leq \alpha (TDGL)(T)\leq 0.95$ and $1.17 \leq \alpha (RSJ)(T) \leq 1.27$, while the dynamic critical exponents $z(TDGL)\sim 2.0$ and $z(RSJ)\sim 0.9$. Contrary to expectation the TDGL results are in closer agreement with the experiments in Josephson-junction arrays by Shaw et al., than those from the RSJ model. We find that these results are related to anomalous vortex diffusion through vortex clusters. Comment: 4 pages Rev-Tex, two figures in postscript. To appear In Physical Review Letters |
| Databáze: | OpenAIRE |
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