Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi2Sr2LaCuO6+δ

DOI: 10.1073/pnas.2001755117

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