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Instruments / Technical Area	Publication Details	Published
I05-ARPES	Pseudogap suppression by competition with superconductivity in La-based cuprates J. Küspert , R. Cohn Wagner , C. Lin , K. Von Arx , Q. Wang , K. Kramer , W. R. Pudelko , N. C. Plumb , C. E. Matt , C. G. Fatuzzo , D. Sutter , Y. Sassa , J.-Q. Yan , J.-S. Zhou , J. B. Goodenough , S. Pyon , T. Takayama , H. Takagi , T. Kurosawa , N. Momono , M. Oda , M. Hoesch , C. Cacho , T. K. Kim , M. Horio , J. Chang Physical Review Research 4 DOI: 10.1103/PhysRevResearch.4.043015 Diamond Proposal Number(s): [27768, 10550] Open Access Show Abstract ▼ Abstract: We carried out a comprehensive high-resolution angle-resolved photoemission spectroscopy (ARPES) study of the pseudogap interplay with superconductivity in La-based cuprates. The three systems La 2 − x Sr x CuO 4 , La 1.6 − x Nd 0.4 Sr x CuO 4 , and La 1.8 − x Eu 0.2 Sr x CuO 4 display slightly different pseudogap critical points in the temperature versus doping phase diagram. We studied the pseudogap evolution into the superconducting state for doping concentrations just below the critical point. In this setting, near optimal doping for superconductivity and in the presence of the weakest possible pseudogap, we uncover how the pseudogap is partially suppressed inside the superconducting state. This conclusion is based on the direct observation of a reduced pseudogap energy scale and re-emergence of spectral weight suppressed by the pseudogap. Altogether these observations suggest that the pseudogap phenomenon in La-based cuprates is in competition with superconductivity for antinodal spectral weight.	Oct 2022
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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