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

DOI: 10.1126/sciadv.abg7394 DOI Help

Authors: Qisi Wang (Universität Zürich) , Karin Von Arx (Universität Zürich; Chalmers University of Technology) , Masafumi Horio (Universität Zürich) , Deepak John Mukkattukavil (Uppsala University) , Julia Kuespert (University of Zurich) , Yasmine Sassa (Chalmers University of Technology) , Thorsten Schmitt (Swiss Light Source) , Abhishek Nag (Diamond Light Source) , Sunseng Pyon (The University of Tokyo) , Tomohiro Takayama (Max Planck Institute for Solid State Research) , Hidenori Takagi (The University of Tokyo) , Mirian Garcia-Fernandez (Diamond Light Source) , Ke-Jin Zhou (Diamond Light Source) , Johan Chang (Universität Zürich)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Science Advances , VOL 7

State: Published (Approved)
Published: June 2021
Diamond Proposal Number(s): 24481

Open Access Open Access

Abstract: 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.

Subject Areas: Materials, Physics

Instruments: I21-Resonant Inelastic X-ray Scattering (RIXS)

Added On: 02/07/2021 08:10


Discipline Tags:

Quantum Materials Hard condensed matter - electronic properties Physics Materials Science

Technical Tags:

Scattering Resonant Inelastic X-ray Scattering (RIXS)