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PHYSICAL REVIEW B 83, 224515 (2011) Fluctuating pancake vortices revealed by dissipation of the Josephson vortex lattice
 

Summary: PHYSICAL REVIEW B 83, 224515 (2011)
Fluctuating pancake vortices revealed by dissipation of the Josephson vortex lattice
A. E. Koshelev
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
A. I. Buzdin
Institut Universit´e de France and Universit´e de Bordeaux, LOMA, UMR 5798, F-33405 Talence, France
I. Kakeya
Department of Electronic Science and Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
T. Yamamoto*
and K. Kadowaki
Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
(Received 4 April 2011; published 27 June 2011)
In strongly anisotropic layered superconductors in tilted magnetic fields, the Josephson vortex lattice coexists
with the lattice of pancake vortices. Due to the interaction between them, the dissipation of the Josephson vortex
lattice is very sensitive to the presence of the pancake vortices. If the c-axis magnetic field is smaller than the
corresponding lower critical field, the pancake stacks are not formed but the individual pancakes may exist in the
fluctuational regime either near the surface in large-size samples or in the central region for small-size mesas. We
calculate the contribution of such fluctuating pancake vortices to the c-axis conductivity of the Josephson vortex
lattice and compare the theoretical results with measurements on small mesas fabricated out of Bi2Sr2CaCu2O8+
crystals. A fingerprint of fluctuating pancakes is a characteristic exponential dependence of the c-axis conductivity

  

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

 

Collections: Materials Science; Physics