Charge order lock-in by electron-phonon coupling in La1.675Eu0.2Sr0.125CuO4.
Qisi WangKarin von ArxMasafumi HorioDeepak John MukkattukavilJulia KüspertYasmine SassaThorsten SchmittAbhishek NagSunseng PyonTomohiro TakayamaHidenori TakagiMirian Garcia-FernandezKe-Jin ZhouJohan ChangPublished in: Science advances (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.