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Instruments / Technical Area	Publication Details	Published	Actions
I21-Resonant Inelastic X-ray Scattering (RIXS)	Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi2Sr2LaCuO6+δ Jiemin Li , Abhishek Nag , Jonathan Pelliciari , Hannah Robarts , Andrew Walters , Mirian Garcia-fernandez , Hiroshi Eisaki , Dongjoon Song , Hong Ding , Steven Johnston , Riccardo Comin , Kejin Zhou Proceedings Of The National Academy Of Sciences 89 DOI: 10.1073/pnas.2001755117 Diamond Proposal Number(s): [19886, 21184, 21277] Open Access Show Abstract ▼ Abstract: Charge-density waves (CDWs) are ubiquitous in underdoped cuprate superconductors. As a modulation of the valence electron density, CDWs in hole-doped cuprates possess both Cu-3d and O-2p orbital character owing to the strong hybridization of these orbitals near the Fermi level. Here, we investigate underdoped Bi2Sr1.4La0.6CuO6+δ using resonant inelastic X-ray scattering (RIXS) and find that a short-range CDW exists at both Cu and O sublattices in the copper-oxide (CuO2) planes with a comparable periodicity and correlation length. Furthermore, we uncover bond-stretching and bond-buckling phonon anomalies concomitant to the CDWs. Comparing to slightly overdoped Bi2Sr1.8La0.2CuO6+δ, where neither CDWs nor phonon anomalies appear, we highlight that a sharp intensity anomaly is induced in the proximity of the CDW wavevector (QCDW) for the bond-buckling phonon, in concert with the diffused intensity enhancement of the bond-stretching phonon at wavevectors much greater than QCDW. Our results provide a comprehensive picture of the quasistatic CDWs, their dispersive excitations, and associated electron-phonon anomalies, which are key for understanding the competing electronic instabilities in cuprates.	Jun 2020
I21-Resonant Inelastic X-ray Scattering (RIXS)	Strongly correlated charge density wave in La2−xSrxCuO4 evidenced by doping-dependent phonon anomaly J. Q. Lin , H. Miao , D. G. Mazzone , G. D. Gu , A. Nag , A. C. Walters , M. Garcia-fernandez , A. Barbour , J. Pelliciari , I. Jarrige , M. Oda , K. Kurosawa , N. Momono , K. Zhou , V. Bisogni , X. Liu , M. P. M. Dean Physical Review Letters 124 DOI: 10.1103/PhysRevLett.124.207005 Diamond Proposal Number(s): [22261] Show Abstract ▼ Abstract: The discovery of charge-density-wave-related effects in the resonant inelastic x-ray scattering spectra of cuprates holds the tantalizing promise of clarifying the interactions that stabilize the electronic order. Here, we report a comprehensive resonant inelastic x-ray scattering study of La 2 − x Sr x CuO 4 finding that charge-density wave effects persist up to a remarkably high doping level of x = 0.21 before disappearing at x = 0.25 . The inelastic excitation spectra remain essentially unchanged with doping despite crossing a topological transition in the Fermi surface. This indicates that the spectra contain little or no direct coupling to electronic excitations near the Fermi surface, rather they are dominated by the resonant cross section for phonons and charge-density-wave-induced phonon softening. We interpret our results in terms of a charge-density wave that is generated by strong correlations and a phonon response that is driven by the charge-density-wave-induced modification of the lattice.	May 2020

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