Langevin simulations of the out-of-equilibrium dynamics of vortex glasses in high-temperature superconductors

Bustingorry  S; Cugliandolo  LF; Dominguez  D

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Langevin simulations of the out-of-equilibrium dynamics of vortex glasses in high-temperature superconductors

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We study the relaxation dynamics of flux lines in dirty high-temperature superconductors using numerical simulations of a London-Langevin model of the interacting vortex lines. By analyzing the equilibrium dynamics in the vortex liquid phase we find a dynamic crossover to a glassy nonequilibrium regime. We then focus on the out-of-equilibrium dynamics of the vortex glass phase using tools that are common in the study of other glassy systems. By monitoring the two-times roughness and dynamic wandering we identify and characterize finite-size effects that are similar, though more complex, than the ones found in the stationary roughness of clean interface dynamics. The two-times density-density correlation and mean-squared-displacement correlation age and their temporal scaling follows a multiplicative law similar to the one found at criticality. The linear responses also age and the comparison with their associated correlations shows that the equilibrium fluctuation-dissipation relation is modified in a simple manner that allows for the identification of an effective temperature characterizing the dynamics of the slow modes. The effective temperature is closely related to the vortex liquid-vortex glass crossover temperature. Interestingly enough, our study demonstrates that the glassy dynamics in the vortex glass is basically identical to the one of a single elastic line in a disordered environment (with the same type of scaling though with different parameters). Possible extensions and the experimental relevance of these results are also discussed.

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《Physical review, B. Condensed matter and materials physics》 |2007年第2期|4506-1-4506-21-0|共21页
作者
Bustingorry S; Cugliandolo LF; Dominguez D;
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作者单位

Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

Univ Paris 06, LPTHE, UMR 7589, F-75252 Paris 05, France;

LPT Ecole Normale Super, F-75231 Paris 05, France;

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正文语种英语
中图分类固体物理学;
关键词
FLUCTUATION-DISSIPATION RELATION; NONEQUILIBRIUM CRITICAL-DYNAMICS; DIMENSIONAL RANDOM-ENVIRONMENTS; 3-DIMENSIONAL GAUGE-GLASS; EPITAXIAL-GROWTH FRONT; T-C SUPERCONDUCTORS; GIANT FLUX CREEP; II SUPERCONDUCTORS; PHASE-DIAGRAM; UNTWINNED YBA2CU3O7;

Langevin simulations of the out-of-equilibrium dynamics of vortex glasses in high-temperature superconductors

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