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Persistent low-energy phonon broadening near the charge-order q vector in the bilayer cuprate Bi2Sr2CaCu2 O8+δ

  • Author(s): He, Y
  • Wu, S
  • Song, Y
  • Lee, WS
  • Said, AH
  • Alatas, A
  • Bosak, A
  • Girard, A
  • Souliou, SM
  • Ruiz, A
  • Hepting, M
  • Bluschke, M
  • Schierle, E
  • Weschke, E
  • Lee, JS
  • Jang, H
  • Huang, H
  • Hashimoto, M
  • Lu, DH
  • Song, D
  • Yoshida, Y
  • Eisaki, H
  • Shen, ZX
  • Birgeneau, RJ
  • Yi, M
  • Frano, A
  • et al.

© 2018 American Physical Society. We report a persistent low-energy phonon broadening around qB∼0.28 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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