Figure 2: Changing Cu and O valency as a function of B-site.
From: Competition between heavy fermion and Kondo interaction in isoelectronic A-site-ordered perovskites
(a) Soft XAS on the Cu L-edge for all samples showing the changing Cu valence. The dotted line is the spectrum before the subtraction of the impurity peak (note that CCCoO TFY data and explanation of impurity peak originally given in ref. 24). The dashed line indicates the energy of the d9 peak. (b) XAS on the O K-edge showing both the reduction of the pre-peak on O and the shifting of the O 2p–Cu 3d and O 2p–B-site d hybridized orbitals. The dashed line here indicates the energy of the O pre-peak associated with a doped hole.
