Four-Unit-Cell Superstructure in the Optimally Doped YBa2Cu3O6.92 Superconductor

Zahirul Islam, X. Liu, S. K. Sinha, J. C. Lang, S. C. Moss, D. Haskel, G. Srajer, P. Wochner, D. R. Lee, D. R. Haeffner, and U. Welp
Phys. Rev. Lett. 93, 157008 – Published 7 October 2004

Abstract

Diffuse x-ray scattering measurements reveal that the optimally doped YBa2Cu3O6.92 superconductor is intrinsically modulated due to the formation of a kinetically limited 4-unit-cell superlattice, q0=(14,0,0), along the shorter Cu-Cu bonds. The superlattice consists of large anisotropic displacements of Cu, Ba, and O atoms, respectively, which are correlated over 36 unit cells in the ab plane, and appears to be consistent with the presence of an O-ordered “ortho-IV” phase. Long-range strains emanating from these modulated regions generate an inhomogeneous lattice which may play a fundamentally important role in the electronic properties of yttrium-barium-copper-oxides.

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  • Received 23 December 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.157008

©2004 American Physical Society

Authors & Affiliations

Zahirul Islam1,*, X. Liu2, S. K. Sinha2, J. C. Lang1, S. C. Moss3, D. Haskel1, G. Srajer1, P. Wochner4, D. R. Lee1, D. R. Haeffner1, and U. Welp5

  • 1Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Department of Physics, University of California, San Diego, California 92093, USA
  • 3Department of Physics and Texas Center for Superconductivity and Advanced Materials, University of Houston, Houston, Texas 77204, USA
  • 4Max-Planck-Institut für Metallforschung, 70569 Stuttgart, Germany
  • 5Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *Email Address: zahir@aps.anl.gov

See Also

Oxygen Superstructures Throughout the Phase Diagram of (Y,Ca)Ba2Cu3O6+x

J. Strempfer, I. Zegkinoglou, U. Rütt, M. v. Zimmermann, C. Bernhard, C. T. Lin, Th. Wolf, and B. Keimer
Phys. Rev. Lett. 93, 157007 (2004)

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Vol. 93, Iss. 15 — 8 October 2004

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