1. Spin excitations in Nd1-xSrxNiO2 and YBa2Cu3O7-delta: the influence of Hubbard U
- Author
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Rosa, Francesco, Martinelli, Leonardo, Krieger, Guillaume, Braicovich, Lucio, Brookes, Nicholas B., Merzoni, Giacomo, Sala, Marco Moretti, Yakhou-Harris, Flora, Arpaia, Riccardo, Preziosi, Daniele, Salluzzo, Marco, Fidrysiak, Maciej, and Ghiringhelli, Giacomo
- Subjects
Condensed Matter - Strongly Correlated Electrons ,Quantum Physics - Abstract
We use Resonant Inelastic X-ray Scattering (RIXS) to compare the doping dependence of magnetic excitations of an Infinite-Layer nickelate to those of a prototypical superconducting cuprate. The polarization analysis of RIXS spectra establishes the dominant spin-flip nature of the mid-infrared peak in both cases. Hole doping leads to opposite behavior of the magnetic energy in the two materials. By fitting the data with an original Hubbard-based model for dynamic susceptibility, we find that t is comparable in the two materials while U is about twice larger in the nickelate. This finding accounts for the smaller magnetic bandwidth of nickelates and for its decrease upon doping., Comment: 7 pages with bibliography, 4 figures
- Published
- 2024