- Tytuł:
- Spin excitations in Nd$_{1-x}$Sr$_{x}$NiO$_{2}$ and YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ : the influence of Hubbard U
- Autorzy:
-
Krieger, Guillaume
Brookes, Nicholas B.
Merzoni, Giacomo
Moretti Sala, Marco
Fidrysiak, Maciej
Ghiringhelli, Giacomo
Martinelli, Leonardo
Braicovich, Lucio
Yakhou-Harris, Flora
Arpaia, Riccardo
Preziosi, Daniele
Salluzzo, Marco
Rosa, Francesco - Opis:
- 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 midinfrared 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.
- Dostawca treści:
- Repozytorium Uniwersytetu Jagiellońskiego
Artykuł