Volume 76, Number 4, November 2006
|Page(s)||554 - 560|
|Published online||18 October 2006|
Glassy dynamics, aging and temperature-induced avalanches in interface pinning at finite temperatures
Physics Department, Emory University - Atlanta, GA 30322, USA
2 Instituto de Física de Cantabria (IFCA), CSIC-UC - E-39005 Santander, Spain
Accepted: 22 September 2006
We study numerically the out-of-equilibrium dynamics of interfaces at finite temperatures when driven well below the zero-temperature depinning threshold. We go further than previous analysis by including the most relevant non-equilibrium correction to the elastic Hamiltonian. We find that the relaxation dynamics towards the steady state shows glassy behaviour, aging and violation of the fluctuation-dissipation theorem. The interface roughness exponent is found to be robust to temperature changes. We also study the instantaneous velocity signal in the low-temperature regime and find long-range temporal correlations. We argue that -noise arises from the merging of local temperature-induced avalanches of depinning events.
PACS: 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 68.35.Fx – Diffusion; interface formation / 74.25.Qt – Vortex lattices, flux pinning, flux creep
© EDP Sciences, 2006
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