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Instruments / Technical Area	Publication Details	Published	Actions
I21-Resonant Inelastic X-ray Scattering (RIXS)	Gapped collective charge excitations and interlayer hopping in cuprate superconductors M. Hepting , M. Bejas , A. Nag , H. Yamase , N. Coppola , D. Betto , C. Falter , Mirian Garcia-Fernandez , S. Agrestini , K.-J. Zhou , M. Minola , C. Sacco , L. Maritato , P. Orgiani , H. I. Wei , K. M. Shen , D. G. Schlom , A. Galdi , A. Greco , B. Keimer Physical Review Letters 129 DOI: 10.1103/PhysRevLett.129.047001 Diamond Proposal Number(s): [23933] Open Access Show Abstract ▼ Abstract: We use resonant inelastic x-ray scattering to probe the propagation of plasmons in the electron-doped cuprate superconductor Sr 0.9 La 0.1 CuO 2 . We detect a plasmon gap of ∼ 120 meV at the two-dimensional Brillouin zone center, indicating that low-energy plasmons in Sr 0.9 La 0.1 CuO 2 are not strictly acoustic. The plasmon dispersion, including the gap, is accurately captured by layered t − J − V model calculations. A similar analysis performed on recent resonant inelastic x-ray scattering data from other cuprates suggests that the plasmon gap is generic and its size is related to the magnitude of the interlayer hopping t z . Our work signifies the three dimensionality of the charge dynamics in layered cuprates and provides a new method to determine t z .	Jul 2022
I21-Resonant Inelastic X-ray Scattering (RIXS)	Crystalline and magnetic structure of Ba2CuO3+δ investigated by x-ray absorption spectroscopy and resonant inelastic x-ray scattering Roberto Fumagalli , Abhishek Nag , Stefano Agrestini , Mirian Garcia-Fernandez , Andrew C. Walters , Davide Betto , Nicholas B. Brookes , Lucio Braicovich , Ke-Jin Zhou , Giacomo Ghiringhelli , Marco Moretti Sala Physica C: Superconductivity And Its Applications DOI: 10.1016/j.physc.2020.1353810 Diamond Proposal Number(s): [23423] Show Abstract ▼ Abstract: Motivated by the recent synthesis of Ba CuO (BCO), a high temperature superconducting cuprate with putative ground state symmetry, we investigated its electronic structure by means of Cu x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS) at the Cu edge on a polycrystalline sample. We show that the XAS profile of BCO is characterised by two peaks associated to inequivalent Cu sites, and that its RIXS response features a single, sharp peak associated to crystal-field excitations. We argue that these observations are only partially compatible with the previously proposed crystal structure of BCO. Based on our spectroscopic results and on previously published powder diffraction measurements, we propose a crystalline structure characterized by two inequivalent Cu sites located at alternated planes along the axis: nominally trivalent Cu(1) belonging to very short Cu-O chains, and divalent Cu(2) in the oxygen deficient CuO planes. We also analyze the low-energy region of the RIXS spectra to estimate the magnitude of the magnetic interactions in BCO and find that in-plane nearest neighbor superexchange exceeds 120 meV, similarly to that of other layered cuprates. Although these results do not support the pure ground state scenario, they hint at a significant departure from the common quasi-2D electronic structure of superconducting cuprates of pure symmetry.	Dec 2020

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