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Slowing down the Josephson vortex lattice in Bi2Sr2CaCu2O8+ with pancake vortices A. E. Koshelev
 

Summary: Slowing down the Josephson vortex lattice in Bi2Sr2CaCu2O8+ with pancake vortices
A. E. Koshelev
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Yu. I. Latyshev
Institute of Radio-Engineering and Electronics, Russian Academy of Sciences, Mokhovaya 11-7, 101999 Moscow, Russia
M. Konczykowski
Laboratoire des Solides Irradiés, CNRS UMR 7642, Ecole Polytechnique, 91128 Palaiseau, France
Received 25 May 2006; published 25 September 2006
We study theoretically and experimentally the influence of pancake vortices on motion of the Josephson
vortex lattice in layered high-temperature superconductors. Mobility of the Josephson vortices in layered
superconductors is strongly suppressed by a small amount of pancake-vortex stacks. Moving Josephson vortex
lattice forces oscillating zigzag deformation of the pancake-vortex stacks contributing to damping. The salient
feature of this contribution is its nonmonotonic dependence on the lattice velocity and the corresponding
voltage. Maximum pancake effect is realized when the Josephson frequency matches the relaxation frequency
of the stacks. The pancake-vortex damping is strongly suppressed by thermal fluctuations of the pancake
vortices. This theoretical picture was qualitatively confirmed by experiments on two mesas prepared out of
Bi2Sr2CaCu2O8+ whiskers. We found that the Josephson-vortex flux-flow voltage is very sensitive to small
c-axis magnetic field. The pancake-vortex contribution to the current indeed nonmonotonically depends on
voltage and decreases with increasing temperature and in-plane magnetic field. We also found that irradiation
with heavy ions has no noticeable direct influence on motion of the Josephson vortices but dramatically

  

Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory

 

Collections: Materials Science; Physics