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Instruments / Technical Area	Publication Details	Published	Actions
I21-Resonant Inelastic X-ray Scattering (RIXS)	Charge order lock-in by electron-phonon coupling in La1.675Eu0.2Sr0.125CuO4 Qisi Wang , Karin Von Arx , Masafumi Horio , Deepak John Mukkattukavil , Julia Kuespert , Yasmine Sassa , Thorsten Schmitt , Abhishek Nag , Sunseng Pyon , Tomohiro Takayama , Hidenori Takagi , Mirian Garcia-Fernandez , Ke-Jin Zhou , Johan Chang Science Advances 7 DOI: 10.1126/sciadv.abg7394 Diamond Proposal Number(s): [24481] Open Access Show Abstract ▼ 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.	Jun 2021
I21-Resonant Inelastic X-ray Scattering (RIXS)	High-temperature charge-stripe correlations in La1.675Eu0.2Sr0.125CuO4 Q. Wang , M. Horio , K. Von Arx , Y. Shen , D. John Mukkattukavil , Y. Sassa , O. Ivashko , C. E. Matt , S. Pyon , T. Takayama , H. Takagi , T. Kurosawa , N. Momono , M. Oda , T. Adachi , S. M. Haidar , Y. Koike , Y. Tseng , W. Zhang , J. Zhao , K. Kummer , M. Garcia-Fernandez , K. Zhou , N. B. Christensen , H. M. Ronnow , T. Schmitt , J. Chang Physical Review Letters 124 DOI: 10.1103/PhysRevLett.124.187002 Diamond Proposal Number(s): [20828, 24481] Show Abstract ▼ Abstract: We use resonant inelastic x-ray scattering to investigate charge-stripe correlations in La 1.675 Eu 0.2 Sr 0.125 CuO 4 . By differentiating elastic from inelastic scattering, it is demonstrated that charge-stripe correlations precede both the structural low-temperature tetragonal phase and the transport-defined pseudogap onset. The scattering peak amplitude from charge stripes decays approximately as T − 2 towards our detection limit. The in-plane integrated intensity, however, remains roughly temperature independent. Therefore, although the incommensurability shows a remarkably large increase at high temperature, our results are interpreted via a single scattering constituent. In fact, direct comparison to other stripe-ordered compounds ( La 1.875 Ba 0.125 CuO 4 , La 1.475 Nd 0.4 Sr 0.125 CuO 4 , and La 1.875 Sr 0.125 CuO 4 ) suggests a roughly constant integrated scattering intensity across all these compounds. Our results therefore provide a unifying picture for the charge-stripe ordering in La-based cuprates. As charge correlations in La 1.675 Eu 0.2 Sr 0.125 CuO 4 extend beyond the low-temperature tetragonal and pseudogap phase, their emergence heralds a spontaneous symmetry breaking in this compound.	May 2020

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