title: X-ray diffraction observations of a charge-density-wave order in superconducting ortho-II YBa2Cu3O6.54 single crystals in zero magnetic field.
abstract: X-ray diffraction measurements show that the high-temperature superconductor YBa2Cu3O6.54, with ortho-II oxygen order, has charge-density-wave order in the absence of an applied magnetic field. The dominant wave vector of the charge density wave is q(CDW)=(0,0.328(2),0.5), with the in-plane component parallel to the b axis (chain direction). It has a similar incommensurability to that observed in ortho-VIII and ortho-III samples, which have different dopings and oxygen orderings. Our results for ortho-II contrast with recent high-field NMR measurements, which suggest a commensurate wave vector along the a axis. We discuss the relationship between spin and charge correlations in YBa2Cu3O(y) and recent high-field quantum oscillation, NMR, and ultrasound experiments.
authors.affiliation: School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom.
authors.forename: E
authors.initials: E
authors.lastname: Blackburn
authors.forename: J
authors.initials: J
authors.lastname: Chang
authors.forename: M
authors.initials: M
authors.lastname: Hücker
authors.forename: A T
authors.initials: AT
authors.lastname: Holmes
authors.forename: N B
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authors.lastname: Christensen
authors.forename: Ruixing
authors.initials: R
authors.lastname: Liang
authors.forename: D A
authors.initials: DA
authors.lastname: Bonn
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy
authors.forename: U
authors.initials: U
authors.lastname: Rütt
authors.forename: O
authors.initials: O
authors.lastname: Gutowski
authors.forename: M
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authors.lastname: von Zimmermann
authors.forename: E M
authors.initials: EM
authors.lastname: Forgan
authors.forename: S M
authors.initials: SM
authors.lastname: Hayden