Resonant elastic soft x-ray scattering in oxygen-ordered YBa_2Cu_3O_{6+delta}

Abstract

Static charge-density wave (CDW) and spin-density wave (SDW) order has been convincingly observed in La-based cuprates for some time. However, more recently it has been suggested by quantum oscillation, transport and thermodynamic measurements that density wave order is generic to underdoped cuprates and plays a significant role in YBa_2Cu_3O_{6+delta} (YBCO). We use resonant soft x-ray scattering at the Cu L and O K edges to search for evidence of density wave order in Ortho-II and Ortho-VIII oxygen-ordered YBCO. We report a null result -- no evidence for static CDW order -- in both Ortho-II and Ortho-VIII ordered YBCO. While this does not rule out static CDW order in the CuO_2 planes of YBCO, these measurements place limits on the parameter space (temperature, magnetic field, scattering vector) in which static CDW order may exist. In addition, we present a detailed analysis of the energy and polarization dependence of the Ortho-II superstructure Bragg reflection [0.5 0 0] at the Cu L edge. The intensity of this peak, which is due to the valence modulations of Cu in the chain layer, is compared with calculations using atomic scattering form factors deduced from x-ray absorption measurements. The calculated energy and polarization dependence of the scattering intensity is shown to agree very well with the measurement, validating the approach and providing a framework for analyzing future resonant soft x-ray scattering measurements.

11 pages, 9 figures

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• Resonant x-ray scattering studies of charge order in cuprates
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• Momentum-dependent charge correlations in YBa${}_2$Cu${}_3$O${}_{6+\delta }$ superconductors probed by resonant x-ray scattering: Evidence for three competing phases
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• Impact of Quenched Oxygen Disorder on Charge Density Wave Order in YBa${}_2$Cu${}_3$O${}_{6+x}$
• Absence of $3a_0$ Charge Density Wave Order in the Infinite Layer Nickelates
• Electron sampling depth and saturation effects in perovskite films investigated by soft x-ray absorption spectroscopy
• Stabilization of three-dimensional charge order in YBa${}_2$Cu${}_3$O${}_{6+x}$ via epitaxial growth
• Resonant X-Ray Scattering Measurements of a Spatial Modulation of the Cu 3d and O 2p Energies in Stripe-Ordered Cuprate Superconductors
• Review on quasi-2D square planar nickelates
• Bond-Order and the Role of Ligand States in Stripe-Modulated IrTe2
• Orbital Symmetries of Charge Density Wave Order in YBa2Cu3O6+x
• Doping-dependence of the electron-phonon coupling in two families of bilayer superconducting cuprates
• Self-passivated freestanding superconducting oxide film for flexible electronics
• Observation of a Three-Dimensional Quasi-Long-Range Electronic Supermodulation in YBa2Cu3O7-x/La0.7Ca0.3MnO3 Heterostructures
• Superconductor to Mott insulator transition in YBa${}_2$Cu${}_3$O${}_7$/LaCaMnO${}_3$ heterostructures
• Crystalline and magnetic structure of Ba2CuO3+δ investigated by x-ray absorption spectroscopy and resonant inelastic x-ray scattering
• Synthesis of high-oxidation Y-Ba-Cu-O phases in superoxygenated thin films
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