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1/omega-flux-noise and dynamical critical properties of two-dimensional XY-models | | P. H. E. Tiesinga
; T. J. Hagenaars
; J. E. van Himbergen
; Jorge V. José
; | | Date: |
26 Nov 1996 | | Journal: | Phys. Rev. Lett. 78 (1997) 519 | | Subject: | Superconductivity; Statistical Mechanics | cond-mat.supr-con cond-mat.stat-mech | | Abstract: | 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 $S_{Phi}(omega)sim vert 1+ {(omega/Omega)}^2vert^{-alpha (T)/2}$, with $0.85leq alpha (TDGL)(T)leq 0.95$ 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. | | Source: | arXiv, cond-mat/9611208 | | Services: | Forum | Review | PDF | Favorites | |
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