Distinct Charge Orders in the Planes and Chains of Ortho-III-Ordered YBa2Cu3O6+δ Superconductors Identified by Resonant Elastic X-ray Scattering

A. J. Achkar, R. Sutarto, X. Mao, F. He, A. Frano, S. Blanco-Canosa, M. Le Tacon, G. Ghiringhelli, L. Braicovich, M. Minola, M. Moretti Sala, C. Mazzoli, Ruixing Liang, D. A. Bonn, W. N. Hardy, B. Keimer, G. A. Sawatzky, and D. G. Hawthorn
Phys. Rev. Lett. 109, 167001 – Published 17 October 2012

Abstract

Recently, charge density wave (CDW) order in the CuO2 planes of underdoped YBa2Cu3O6+δ was detected using resonant soft x-ray scattering. An important question remains: is the chain layer responsible for this charge ordering? Here, we explore the energy and polarization dependence of the resonant scattering intensity in a detwinned sample of YBa2Cu3O6.75 with ortho-III oxygen ordering in the chain layer. We show that the ortho-III CDW order in the chains is distinct from the CDW order in the planes. The ortho-III structure gives rise to a commensurate superlattice reflection at Q=[0.330L] whose energy and polarization dependence agrees with expectations for oxygen ordering and a spatial modulation of the Cu valence in the chains. Incommensurate peaks at [0.30 0 L] and [0 0.30 L] from the CDW order in the planes are shown to be distinct in Q as well as their temperature, energy, and polarization dependence, and are thus unrelated to the structure of the chain layer. Moreover, the energy dependence of the CDW order in the planes is shown to result from a spatial modulation of energies of the Cu 2p to 3dx2y2 transition, similar to stripe-ordered 214 cuprates.

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  • Received 16 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.167001

© 2012 American Physical Society

Authors & Affiliations

A. J. Achkar1, R. Sutarto2,3, X. Mao1, F. He3, A. Frano4,5, S. Blanco-Canosa4, M. Le Tacon4, G. Ghiringhelli6, L. Braicovich6, M. Minola6, M. Moretti Sala7, C. Mazzoli6, Ruixing Liang2, D. A. Bonn2, W. N. Hardy2, B. Keimer4, G. A. Sawatzky2, and D. G. Hawthorn1,*

  • 1Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
  • 2Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
  • 3Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0X4
  • 4Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany
  • 5Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, D-12489 Berlin, Germany
  • 6CNR-SPIN, CNISM and Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
  • 7European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France

  • *dhawthor@uwaterloo.ca.

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Vol. 109, Iss. 16 — 19 October 2012

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