Rapid Suppression of the Charge Density Wave in YBa${}_2$Cu${}_3$O${}_{6.6}$ under Hydrostatic Pressure

Abstract

We report on the effects of hydrostatic pressure (HP) on the charge density wave observed in underdoped cuprates. We studied YBa${}_2$Cu${}_3$O${}_{6.6}$ ($T_c$=61 K) using high-resolution inelastic x-ray scattering (IXS), and reveal an extreme sensitivity of the phonon anomalies related to the charge density wave (CDW) order to HP. The amplitudes of the normal state broadening and superconductivity induced phonon softening at Q${}_{CDW}$ rapidly decrease as HP is applied, resulting in the complete suppression of signatures of the CDW below $\sim$1 GPa. Additional IXS measurements on YBa${}_2$Cu${}_3$O${}_{6.75}$ demonstrate that this very rapid effect cannot be explained by pressure-induced modification of the doping level and highlight the different role of external pressure and doping in tuning the phase diagram of the cuprates. Our results provide new insights into the mechanisms underlying the CDW formation and its interplay with superconductivity.

6 pages, 3 figures

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Cited by in corpus (10)

• Electronic and magnetic excitations in La${}_3$Ni${}_2$O${}_7$
• Charge ordering in superconducting copper oxides
• Possible enhancement of the superconducting $T_c$ due to sharp Kohn-like soft phonon anomalies
• Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa${}_2$Cu${}_3$O${}_{\mathrm{y}}$
• In-plane Isotropy of the Low Energy Phonon Anomalies in YBa${}_2$Cu${}_3$O${}_{6+x}$
• Hybridization of lattice and charge order excitations in a superconducting cuprate
• Suppression of superconductivity by charge density wave order in YBa${}_2$Cu${}_3$O${}_{6.67}$
• Doping dependence of the upper critical field in untwinned YBa${}_2$Cu${}_3$O${}_{7-\delta }$ thin films
• Resonant x-ray scattering study of charge-density wave correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$ under uniaxial stress
• Phase diagram of the two-dimensional Hubbard-Holstein model: enhancement of $s$-wave pairing between charge and magnetic orders