Glassy dynamics, aging and temperature-induced avalanches in interface pinning at finite temperaturesJ. 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 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.
© EDP Sciences 2006