In-plane Isotropy of the Low Energy Phonon Anomalies in YBa\(_{2}\)Cu\(_{3}\)O\(_{6+x}\)

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...

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Bibliographic Details
Published in:arXiv.org 2021-07
Main Authors: Sofia-Michaela Souliou, Sen, Kaushik, Heid, Rolf, Nakata, Suguru, Wang, Lichen, Hun-ho, Kim, Uchiyama, Hiroshi, Merz, Michael, Minola, Matteo, Keimer, Bernhard, Matthieu Le Tacon
Format: Article
Language:English
Subjects:
Anomalies
Charge density waves
First principles
High temperature superconductors
Inelastic scattering
Isotropy
Phonons
Temperature dependence
X-ray scattering
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2107.11254