Tilt of Pancake Vortex Stacks in Layered Superconductors in the Crossing Lattice Regime

A. N. Grigorenko, S. J. Bending, I. V. Grigorieva, A. E. Koshelev, T. Tamegai, and S. Ooi

Phys. Rev. Lett. 94, 067001 – Published 14 February 2005

Abstract

We study crossing vortices in strongly anisotropic ${B i}_{2} {S r}_{2} {C a C u}_{2} O_{8 + δ}$ single crystals. Using scanning Hall probe microscopy and Bitter decoration techniques, we find an asymmetry of magnetic field profiles produced by pancake vortices (PVs), which are interacting with Josephson vortices (JVs), near the surface of the crystal. We attribute the observed asymmetry to a substantial tilt (14–18 degrees) of PV stacks, which is produced by the torque due to the surface currents and JVs. We calculate the tilt angle and obtain agreement with experimental data when the irreversible in-plane magnetization is included. A further refinement to the model is considered which accounts for a reduction in the PV stack line tension near the sample surface.

Received 24 September 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.067001

Authors & Affiliations

A. N. Grigorenko¹, S. J. Bending², I. V. Grigorieva¹, A. E. Koshelev³, T. Tamegai⁴, and S. Ooi⁴

¹Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
²Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
³Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁴Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

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Vol. 94, Iss. 6 — 18 February 2005

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