High multipole transitions in NIXS: Valence and hybridization in 4f systems
Abstract
Momentum-transfer (q) dependent non-resonant inelastic X-ray scattering measurements were made at the N4, 5 edges for several rare-earth compounds. With increasing q, giant dipole resonances diminish, to be replaced by strong multiplet lines at lower energy transfer. These multiplets result from two different orders of multipole scattering and are distinct for systems with simple 4f0 and 4f1 initial states. A many-body theoretical treatment of the multiplets agrees well with the experimental data on ionic La and Ce phosphate reference compounds. Comparing measurements on CeO2 and CeRh3 to the theory and the phosphates indicates sensitivity to hybridization as observed by a broadening of 4f0-related multiplet features. We expect such strong, non-dipole features to be generic for NIXS from f-electron systems.
- Publication:
-
EPL (Europhysics Letters)
- Pub Date:
- January 2008
- DOI:
- 10.1209/0295-5075/81/26004
- arXiv:
- arXiv:0712.1242
- Bibcode:
- 2008EL.....8126004G
- Keywords:
-
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Materials Science
- E-Print:
- Europhysics Letters 81 (2008) 26004