High multipole transitions in NIXS: valence and hybridization in 4f systems

Details High multipole transitions in NIXS: valence and hybridization in 4f systems High multipole transitions in NIXS: valence and hybridization in 4f systems

2007-12-07

arxiv.org/abs/0712.1242v1

Europhysics Letters 81 (2008) 26004

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1209/0295-5075/81/26004

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 4f^0 and 4f^1 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 4f^0-related multiplet features. We expect such strong, nondipole features to be generic for NIXS from f-electron systems.

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