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Orbital symmetries of charge density wave order in YBa 2 Cu 3 O 6+ x

Resonant x-ray scattering in YBCO reveals s -symmetry charge order along the b axis but charge/orbital order along the a axis. 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 uncon...

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Bibliographic Details
Published in:Science advances 2020-11, Vol.6 (45)
Main Authors: McMahon, Christopher, Achkar, A. J., da Silva Neto, E. H., Djianto, I., Menard, J., He, F., Sutarto, R., Comin, R., Liang, Ruixing, Bonn, D. A., Hardy, W. N., Damascelli, A., Hawthorn, D. G.
Format: Article
Language:English
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Summary:Resonant x-ray scattering in YBCO reveals s -symmetry charge order along the b axis but charge/orbital order along the a axis. 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 YBa 2 Cu 3 O 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.
ISSN:2375-2548
2375-2548
DOI:10.1126/sciadv.aay0345