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Onset of Motion and Glassy Dynamics of a Moving Vortex Lattice Guohong Li, Eva Y. Andrei, Xu Du, Z. L. Xiao*
 

Summary: Onset of Motion and Glassy Dynamics of a Moving Vortex Lattice
Guohong Li, Eva Y. Andrei, Xu Du, Z. L. Xiao*
, P. Shuk**
and M. Greenblatt**
Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08855 USA
*
Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
**
Department of Chemistry, Rutgers University, Piscataway, NJ 08855, USA
Abstract. 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
~ 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 ( ) characterizing the evolution of voltage response. Both time
scales increase with decreasing saturation voltage V0 : 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.
1. INTRODUCTION
The structure of vortex lattices in type-II superconductors has been a topic of intense study over
the past 50 years [1-3]. Our current understanding of its static properties can be summarized in terms

  

Source: Andrei, Eva Y. - Department of Physics and Astronomy, Rutgers University

 

Collections: Materials Science; Physics