Charge order lock-in by electron-phonon coupling in La1.675 Eu0.2 Sr0.125 CuO4
Journal article, 2021
Charge order is universal to all hole-doped cuprates. Yet, the driving interactions remain an unsolved problem. Electron-electron interaction is widely believed to be essential, whereas the role of electron-phonon interaction is unclear. We report an ultrahigh-resolution resonant inelastic x-ray scattering (RIXS) study of the in-plane bond-stretching phonon mode in stripe-ordered cuprate La1.675Eu0.2Sr0.125CuO4. Phonon softening and lifetime shortening are found around the charge ordering wave vector. In addition to these self-energy effects, the electron-phonon coupling is probed by its proportionality to the RIXS cross section. We find an enhancement of the electron-phonon coupling around the charge-stripe ordering wave vector upon cooling into the low-temperature tetragonal structure phase. These results suggest that, in addition to electronic correlations, electron-phonon coupling contributes substantially to the emergence of long-range charge-stripe order in cuprates.
Author
Q. Wang
University of Zürich
Karin von Arx
University of Zürich
Chalmers, Physics, Materials Physics
M. Horio
University of Zürich
Deepak John Mukkattukavil
Uppsala University
Julia Küspert
University of Zürich
Yasmine Sassa
Chalmers, Physics, Materials Physics
T. Schmitt
Paul Scherrer Institut
Abhishek Nag
Diamond Light Source
S. Pyon
University of Tokyo
T. Takayama
Max Planck Society
H. Takagi
University of Tokyo
M. Garcia-Fernandez
Diamond Light Source
Ke Jin Zhou
Diamond Light Source
J. Chang
University of Zürich
Science advances
2375-2548 (eISSN)
Vol. 7 27 eabg7394Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1126/sciadv.abg7394
PubMed
34193430