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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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Published in: | Science advances 2020-11, Vol.6 (45) |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 2375-2548 2375-2548 |
DOI: | 10.1126/sciadv.aay0345 |