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Fluctuating pancake vortices revealed by dissipation of the Josephson vortex lattice

A. E. Koshelev, A. I. Buzdin, I. Kakeya, T. Yamamoto, and K. Kadowaki
Phys. Rev. B 83, 224515 – Published 27 June 2011

Abstract

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+δ crystals. A fingerprint of fluctuating pancakes is a characteristic exponential dependence of the c-axis conductivity observed experimentally. Our results provide strong evidence of the existence of the fluctuating pancakes and their influence on the Josephson vortex lattice dissipation.

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  • Received 4 April 2011

DOI:https://doi.org/10.1103/PhysRevB.83.224515

©2011 American Physical Society

Authors & Affiliations

A. E. Koshelev

  • Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

A. I. Buzdin

  • Institut Université de France and Université 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

  • *Present address: Quantum Beam Science Directorate, Japan Atomic Energy Agency, Takasaki, Gunma 370-1292, Japan.

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Issue

Vol. 83, Iss. 22 — 1 June 2011

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