Probing electron charge densities with core-level non-resonant inelastic x-ray scattering

by Martin Sundermann (University of Cologne)

109 (25b)



Correlated electron systems yield a plethora of fascinating phenomena, when the physics is beyond the single particle picture and the electron-electron interactions become important. Therefore, the electron charge density is one of the key properties for understanding these materials. Core-level non-resonant inelastic x-ray scattering (core-level NIXS), or x-ray Raman scattering (XRS), is commonly used to perform soft x-ray absorption spectroscopy in a bulk sensitive way. With XRS, however, one can also overcome the dipole selection rules and access higher multipoles by tuning the momentum transfer. I will present how these higher multipoles can be utilized to give an unique insight into electron charge densities and show results for different cubic materials measured at P01 [1-3]. [1] Europhysics Letters 117 17003 (2017) [2] Physical Review Letters 120 016402 (2018) [3] Nature Physics 15 559 (2019)