Orbital symmetries of charge density wave order in YBa2Cu3O6+ x

Christopher McMahon; A J Achkar; E H da Silva Neto; I Djianto; J Menard; F He; R Sutarto; R Comin; Ruixing Liang; D A Bonn; W N Hardy; A Damascelli; D G Hawthorn

doi:10.1126/sciadv.aay0345

Orbital symmetries of charge density wave order in YBa₂Cu₃O_{6+ x}

Sci Adv. 2020 Nov 6;6(45):eaay0345. doi: 10.1126/sciadv.aay0345. Print 2020 Nov.

Authors

Christopher McMahon¹, A J Achkar¹, E H da Silva Neto^{2

3

4

5

6}, I Djianto¹, J Menard¹, F He⁷, R Sutarto⁷, R Comin⁸, Ruixing Liang^{3

9}, D A Bonn^{2

3

9}, W N Hardy^{3

9}, A Damascelli^{2

3

9}, D G Hawthorn^{10

3}

Affiliations

¹ Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
² Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
³ CIFAR, Toronto, Ontario M5G 1Z8, Canada.
⁴ Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
⁵ Department of Physics, University of California, Davis, CA 95616, USA.
⁶ Department of Physics, Yale University, New Haven, CT 06511, USA.
⁷ Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada.
⁸ Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
⁹ Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
¹⁰ Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. [email protected].

Abstract

Charge density wave (CDW) order has been shown to compete and coexist with superconductivity in underdoped cuprates. Theoretical proposals for the CDW order include an unconventional d-symmetry form factor CDW, evidence for which has emerged from measurements, including resonant soft x-ray scattering (RSXS) in YBa₂Cu₃O_6+x (YBCO). Here, we revisit RSXS measurements of the CDW symmetry in YBCO, using a variation in the measurement geometry to provide enhanced sensitivity to orbital symmetry. We show that the (0 0.31 L) CDW peak measured at the Cu L edge is dominated by an s form factor rather than a d form factor as was reported previously. In addition, by measuring both (0.31 0 L) and (0 0.31 L) peaks, we identify a pronounced difference in the orbital symmetry of the CDW order along the a and b axes, with the CDW along the a axis exhibiting orbital order in addition to charge order.

Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).