On Monday, December 23rd 2024 our study of magnetic excitations in the Infinite-Layer nickelate Nd1-xSrxNiO2 has been published on Physical Review B. Besides momentum and polarization-resolved RIXS analysis, a brand-new model is employed to fit the polarimetric data. The figure above shows Energy loss/momentum maps of Nd1−xSrxNiO2, for the two doping levels x=0 (a) and x=0.2 (b). Eye guides for the phonon and magnon peak are displayed in yellow and cyan respectively.
The paper is accessible at the following link:
Rosa et al., Physical Review B, 110(2024), 224431
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.
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