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Persistent low-energy phonon broadening near the charge-order q vector in the bilayer cuprate Bi2Sr2CaCu2O8+δ

Y. He et al.
Phys. Rev. B 98, 035102 – Published 2 July 2018

Abstract

We report a persistent low-energy phonon broadening around qB0.28 reciprocal lattice unit (r.l.u.) along the Cu-O bond direction in the high- Tc cuprate Bi2Sr2CaCu2O8+δ (Bi-2212). We show that such broadening exists both inside and outside the conventional charge-density wave (CDW) phase, via temperature-dependent measurements in both underdoped and heavily overdoped samples. Combining inelastic hard x-ray scattering, diffuse scattering, angle-resolved photoemission spectroscopy, and resonant soft x-ray scattering at the Cu L3 -edge, we exclude the presence of a CDW in the heavily overdoped Bi-2212 similar to that observed in the underdoped systems. Finally, we discuss the origin of such anisotropic low-energy phonon broadening and its potential precursory role to the CDW phase in the underdoped region.

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  • Received 24 April 2018

DOI:https://doi.org/10.1103/PhysRevB.98.035102

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

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Vol. 98, Iss. 3 — 15 July 2018

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