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  Crystalline and magnetic structure of Ba2CuO3+δ investigated by x-ray absorption spectroscopy and resonant inelastic x-ray scattering

Fumagalli, R., Nag, A., Agrestini, S., Garcia-Fernandez, M., Walters, A. C., Betto, D., et al. (2021). Crystalline and magnetic structure of Ba2CuO3+δ investigated by x-ray absorption spectroscopy and resonant inelastic x-ray scattering. Physica C, 581: 1353810, pp. 1-7. doi:10.1016/j.physc.2020.1353810.

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Fumagalli, Roberto1, Author
Nag, Abhishek1, Author
Agrestini, Stefano2, Author              
Garcia-Fernandez, MMirian1, Author
Walters, Andrew C.1, Author
Betto, Davide1, Author
Brookes, Nicholas B.1, Author
Braicovich, Lucio1, Author
Zhou, Ke-Jin1, Author
Ghiringhelli, Giacomo1, Author
Moretti Sala, Marco Moretti1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863459              

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Free keywords: cuprates, RIXS, Superconductivity, XAS, Barium compounds, Chromium compounds, Copper, Copper compounds, Copper metallography, Crystallography, Electronic structure, Ground state, High temperature superconductors, Magnetic structure, X ray absorption spectroscopy, X ray scattering, Crystal field excitations, Crystalline structure, High temperature superconducting, Magnetic interactions, Polycrystalline samples, Powder diffraction measurements, Resonant inelastic x-ray scattering, Superconducting cuprates, Crystal structure
 Abstract: Motivated by the recent synthesis of Ba2CuO3+δ (BCO), a high temperature superconducting cuprate with putative d3z2−r2 ground state symmetry, we investigated its electronic structure by means of Cu L3 x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS) at the Cu L3 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 c axis: nominally trivalent Cu(1) belonging to very short Cu-O chains, and divalent Cu(2) in the oxygen deficient CuO1.5 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 d3z2−r2 ground state scenario, they hint at a significant departure from the common quasi-2D electronic structure of superconducting cuprates of pure dx2−y2 symmetry. © 2020

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Language(s): eng - English
 Dates: 2021-01-302021-01-30
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.physc.2020.1353810
 Degree: -

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Title: Physica C
Source Genre: Journal
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Publ. Info: Amsterdam : North-Holland
Pages: - Volume / Issue: 581 Sequence Number: 1353810 Start / End Page: 1 - 7 Identifier: ISSN: 0921-4534
CoNE: https://pure.mpg.de/cone/journals/resource/954925564683_1