J. Phys. IV France
Volume 131, December 2005
Page(s) 101 - 106
Publié en ligne 18 janvier 2006
International Workshop on Electronic Crystals
S. Brazovskii, P. Monceau and N. Kirova
J. Phys. IV France 131 (2005) 101-106

DOI: 10.1051/jp4:2005131022

Onset of motion and glassy dynamics of a moving vortex lattice

G. Li1, E.Y. Andrei1, X. Du1, Z.L. Xiao2, P. Shuk3 and M. Greenblatt3

1  Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08855, USA
2  Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
3  Department of Chemistry, Rutgers University, Piscataway, NJ 08855, USA

We study the onset of motion of a vortex lattice in response to a driving current that is turned on suddenly. For sufficiently high currents we find that the average vortex velocity (obtained from the longitudinal voltage drop) grows smoothly with time and obeys a stretched exponential with an exponent $\beta \sim 0.7$. The response is governed by two time scales: a delay time (t0) before the appearance of a measurable voltage drop, and a rise time ($\tau $) characterizing the evolution of voltage response. Both time scales increase with decreasing saturation voltage V0 : $\tau $ decreases exponentially, while t0 as a power law. When the saturation velocity is too low the response slows down significantly and shows a step structure indicating plastic response.

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