X-ray scattering study of charge density waves in La2xBaxCuO4

Young-June Kim, G. D. Gu, T. Gog, and D. Casa
Phys. Rev. B 77, 064520 – Published 27 February 2008

Abstract

We report a comprehensive x-ray scattering study of charge density wave (stripe) ordering in La2xBaxCuO4 (x18), for which the bulk superconducting Tc is greatly suppressed. Strong superlattice reflections corresponding to static ordering of charge stripes were observed in this sample. The structural modulation at the lowest temperature was deduced based on the intensity of over 70 unique superlattice positions surveyed. We found that the charge order in this sample is described with one-dimensional charge density waves, which have incommensurate wave vectors (0.23, 0, 0.5) and (0, 0.23, 0.5), respectively, on neighboring CuO2 planes. The structural modulation due to the charge density wave order is simply sinusoidal, and no higher harmonics were observed. Just below the structural transition temperature, short-range charge density wave correlation appears, which develops into a large scale charge ordering around 40K, close to the spin density wave ordering temperature. However, this charge ordering fails to grow into a true long range order, and its correlation length saturates at 230Å, and slightly decreases below about 15K, which may be due to the onset of two-dimensional superconductivity.

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  • Received 7 September 2007

DOI:https://doi.org/10.1103/PhysRevB.77.064520

©2008 American Physical Society

Authors & Affiliations

Young-June Kim1,*, G. D. Gu2, T. Gog3, and D. Casa3

  • 1Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7
  • 2Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
  • 3CMC-XOR, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *yjkim@physics.utoronto.ca

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Vol. 77, Iss. 6 — 1 February 2008

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