Quantitative study of the f occupation in CeMIn5 and other cerium compounds 
with hard X-rays

Sundermann, M.; Strigari, F.; Willers, T.; Weinen, J.; Liao, Y. F.; Tsuei, K.-D.; Hiraoka, N.; Ishii, H.; Yamaoka, H.; Mizuki, J.; Zekko, Y.; Bauer, E. D.; Sarrao, J. L.; Thompson, J. D.; Lejay, P.; Muro, Y.; Yutani, K.; Takabatake, T.; Tanaka, A.; Hollmann, N.; Tjeng, L. H.; Severing, A.

doi:10.1016/j.elspec.2016.02.002

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Quantitative study of the f occupation in CeMIn₅ and other cerium compounds with hard X-rays

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Weinen, J.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hollmann, N.
Nils Hollmann, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng, L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sundermann, M., Strigari, F., Willers, T., Weinen, J., Liao, Y. F., Tsuei, K.-D., et al. (2016). Quantitative study of the f occupation in CeMIn₅ and other cerium compounds with hard X-rays. Journal of Electron Spectroscopy and Related Phenomena, 209, 1-8. doi:10.1016/j.elspec.2016.02.002.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-F699-9

Abstract

We present bulk-sensitive hard X-ray photoelectron spectroscopy (HAXPES) data of the Ce3d core levels and lifetime-reduced L-edge X-ray absorption spectroscopy (XAS) in the partial fluorescence yield (PFY) mode of the CeMIn5 family with M=Co, Rh, and Ir. The HAXPES data are analyzed quantitatively with a combination of full multiplet and configuration interaction model which allows correcting for the strong plasmons in the CeMIn5 HAXPES data, and reliable weights w(n) of the different f(n) contributions in the ground state are determined. The CeMIn5 results are compared to HAXPES data of other heavy fermion compounds and a systematic decrease of the hybridization strength V-eff from CePd3 to CeRh3B2 to CeRu2Si2 is observed, while it is smallest for the three CeMIn5 compounds. The f-occupation, however, increases in the same sequence and is close to one for the CeMIn5 family. The PFY-XAS data confirm an identical f-occupation in the three CeMIn5 compounds and a phenomenological fit to these PFY-XAS data combined with a configuration interaction model yields consistent results. (C) 2016 The Authors. Published by Elsevier B.V.