Charge order lock-in by electron-phonon coupling in La1.675Eu0.2Sr0.125CuO4
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.


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 eabg7394

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics





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