Abstract
X-ray diffraction measurements show that the high-temperature superconductor , with ortho-II oxygen order, has charge-density-wave order in the absence of an applied magnetic field. The dominant wave vector of the charge density wave is , with the in-plane component parallel to the 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 wave vector along the axis. We discuss the relationship between spin and charge correlations in and recent high-field quantum oscillation, NMR, and ultrasound experiments.
- Received 16 December 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.137004
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