Measurement of orbital hybridization in rare earths through electric dipole-octupole interference in x-ray absorption spectroscopy
Amélie Juhin, Stephen P. Collins, Yves Joly, Maria Diaz-Lopez, Kristina Kvashnina, Pieter Glatzel, Christian Brouder, and Frank de Groot
Phys. Rev. Materials 3, 120801(R) (2019) - Published 9 December, 2019
Hybridization between and orbitals is relevant in many applications of rare-earth materials (catalysis, magnetism, nuclear industry) and in fundamental research (Kondo and heavy fermion systems). The authors investigated the ground state mixing between and orbitals in rare earths using high resolution x-ray absorption spectroscopy with linearly polarized x-rays, through the interference between electric dipole (ΔL=1) and octupole (ΔL=3) transitions. The hybridization was quantified by an hexadecapole moment using a sum rule. This approach has been put to the test on Gadolinium Gallium Garnet where states are expected to be localized.
