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Orbital symmetries of charge density wave order in YBa2Cu3O6+x.

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 YBa2Cu3O6+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.

SUBMITTER: McMahon C 

PROVIDER: S-EPMC7673704 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Orbital symmetries of charge density wave order in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+<i>x</i></sub>.

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

Science advances 20201106 45

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 <i>d</i>-symmetry form factor CDW, evidence for which has emerged from measurements, including resonant soft x-ray scattering (RSXS) in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+<i>x</i></sub> (YBCO). Here, we revisit RSXS measurements of the CDW symmetry in YBCO, using a variation in the measurement geometry to provide  ...[more]