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Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi2Sr2LaCuO6+δ
Authors:
Jiemin
Li
(Diamond Light Source; Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences)
,
Abhishek
Nag
(Diamond Light Source)
,
Jonathan
Pelliciari
(Massachusetts Institute of Technology; National Synchrotron Light Source II)
,
Hannah
Robarts
(Diamond Light Source; University of Bristol)
,
Andrew
Walters
(Diamond Light Source)
,
Mirian
Garcia-fernandez
(Diamond Light Source)
,
Hiroshi
Eisaki
(National Institute of Advanced Industrial Science and Technology (AIST))
,
Dongjoon
Song
(National Institute of Advanced Industrial Science and Technology (AIST))
,
Hong
Ding
(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences)
,
Steven
Johnston
(The University of Tennessee)
,
Riccardo
Comin
(Massachusetts Institute of Technology)
,
Kejin
Zhou
(Diamond Light Source)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Proceedings Of The National Academy Of Sciences
, VOL 89
State:
Published (Approved)
Published:
June 2020
Diamond Proposal Number(s):
19886
,
21184
,
21277

Abstract: Charge-density waves (CDWs) are ubiquitous in underdoped cuprate superconductors. As a modulation of the valence electron density, CDWs in hole-doped cuprates possess both Cu-3d and O-2p orbital character owing to the strong hybridization of these orbitals near the Fermi level. Here, we investigate underdoped Bi2Sr1.4La0.6CuO6+δ using resonant inelastic X-ray scattering (RIXS) and find that a short-range CDW exists at both Cu and O sublattices in the copper-oxide (CuO2) planes with a comparable periodicity and correlation length. Furthermore, we uncover bond-stretching and bond-buckling phonon anomalies concomitant to the CDWs. Comparing to slightly overdoped Bi2Sr1.8La0.2CuO6+δ, where neither CDWs nor phonon anomalies appear, we highlight that a sharp intensity anomaly is induced in the proximity of the CDW wavevector (QCDW) for the bond-buckling phonon, in concert with the diffused intensity enhancement of the bond-stretching phonon at wavevectors much greater than QCDW. Our results provide a comprehensive picture of the quasistatic CDWs, their dispersive excitations, and associated electron-phonon anomalies, which are key for understanding the competing electronic instabilities in cuprates.
Journal Keywords: charge-density waves; resonant inelastic X-ray scattering; phonon anomaly; high-temperature; superconducting cuprates
Subject Areas:
Physics,
Materials
Instruments:
I21-Resonant Inelastic X-ray Scattering (RIXS)
Documents:
2001755117.full.pdf