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Vortices in superconducting Ba(Fe0.93Co0.07)2As2 studied via small-angle neutron scattering and Bitter decoration

M. R. Eskildsen, L. Ya. Vinnikov, T. D. Blasius, I. S. Veshchunov, T. M. Artemova, J. M. Densmore, C. D. Dewhurst, N. Ni, A. Kreyssig, S. L. Bud’ko, P. C. Canfield, and A. I. Goldman
Phys. Rev. B 79, 100501(R) – Published 3 March 2009

Abstract

We present small-angle neutron scattering (SANS) and Bitter decoration studies of the superconducting vortices in Ba(Fe0.93Co0.07)2As2. A highly disordered vortex configuration is observed at all measured fields and is attributed to strong pinning. This conclusion is supported by the absence of a Meissner rim in decoration images obtained close to the sample edge. The field dependence of the magnitude of the SANS scattering vector indicates vortex lattice domains of (distorted) hexagonal symmetry, consistent with the decoration images which show primarily sixfold coordinated vortex domains. An analysis of the scattered intensity shows that this decreases much more rapidly than expected from estimates of the upper critical field, consistent with the large degree of disorder.

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  • Received 22 December 2008

DOI:https://doi.org/10.1103/PhysRevB.79.100501

©2009 American Physical Society

Authors & Affiliations

M. R. Eskildsen1,*, L. Ya. Vinnikov2, T. D. Blasius1,†, I. S. Veshchunov2, T. M. Artemova2, J. M. Densmore1, C. D. Dewhurst3, N. Ni4, A. Kreyssig4, S. L. Bud’ko4, P. C. Canfield4, and A. I. Goldman4

  • 1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 2Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia
  • 3Institut Laue-Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France
  • 4Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA

  • *eskildsen@nd.edu
  • Also at University of Michigan.

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Issue

Vol. 79, Iss. 10 — 1 March 2009

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