In-plane Isotropy of the Low Energy Phonon Anomalies in YBa${}_2$Cu${}_3$O${}_{6+x}$

Abstract

We study the temperature dependence of the low energy phonons in the $(H,0,L)$ reciprocal plane of the highly ordered ortho-II YBa${}_2$Cu${}_3$O${}_{6.55}$ cuprate high temperature superconductor by means of high-resolution inelastic x-ray scattering. Anomalies associated with the emergence of long-range charge density wave (CDW) fluctuations are observed, and are qualitatively similar to those previously observed in the $(0,K,L)$ plane. This confirms the unconventional nature of this bi-dimensional CDW, which is not soft-phonon driven. With the support of first principles calculations, the symmetry of the anomalous phonon is identified and is found to match that of the charge modulation. This suggests in turn that these anomalies originate from a direct coupling between the phonons and the collective CDW excitations.

10 pages, Invitated paper on a JPSJ Special Issue "Charge orders and fluctuations in high-Tc cuprates"

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Cited by in corpus (5)

• Possible enhancement of the superconducting $T_c$ due to sharp Kohn-like soft phonon anomalies
• Charge order near the antiferromagnetic quantum critical point in the trilayer high $T_c$ cuprate HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$
• Hybridization of lattice and charge order excitations in a superconducting cuprate
• Resonant x-ray scattering study of charge-density wave correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$ under uniaxial stress
• The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates