Europhys. Lett.
Volume 76, Number 4, November 2006
Page(s) 554 - 560
Section General
Published online 18 October 2006
Europhys. Lett., 76 (4), pp. 554-560 (2006)
DOI: 10.1209/epl/i2006-10316-1

Glassy dynamics, aging and temperature-induced avalanches in interface pinning at finite temperatures

J. J. Ramasco1, J. M. López2 and M. A. Rodríguez2

1  Physics Department, Emory University - Atlanta, GA 30322, USA
2  Instituto de Física de Cantabria (IFCA), CSIC-UC - E-39005 Santander, Spain

received 28 March 2006; accepted in final form 22 September 2006
published online 18 October 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 $\alpha \approx 0.7$ 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 1/f-noise arises from the merging of local temperature-induced avalanches of depinning events.

05.70.Ln - Nonequilibrium and irreversible thermodynamics.
68.35.Fx - Diffusion; interface formation.
74.25.Qt - Vortex lattices, flux pinning, flux creep.

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