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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.
