X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa$_2$Cu$_3$O$_{6.54}$

X-ray diffraction measurements show that the high-temperature superconductor YBa $_{2}$ Cu $_{3}$ O $_{6.54}$ , with ortho-II oxygen order, has charge density wave order (CDW) in the absence of an applied magnetic field. The dominant wavevector of the CDW is $q_{C D W} = (0, 0.328 (2), 0.5)$ , 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 wavevector along the $a$ -axis. We discuss the relationship between spin and charge correlations in YBa $_{2}$ Cu $_{3}$ O $_{y}$ , and recent high-field quantum oscillation, NMR and ultrasound experiments.

X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa $_{2}$ Cu $_{3}$ O $_{6.54}$

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X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa $_{2}$ Cu $_{3}$ O $_{6.54}$

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X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa22​Cu33​O6.546.54​

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X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa22​Cu33​O6.546.54​

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X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa $_{2}$ Cu $_{3}$ O $_{6.54}$

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X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa $_{2}$ Cu $_{3}$ O $_{6.54}$

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