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Itinerant to Localized Heavy Electron Magnetism in Ce(Ru_{1-x}Rh_{x})_{2}Al_{10}: A Direction-Dependent Phase Diagram
Hitoshi Yamaoka1,2, Hiroshi Tanida3, Eike F Schwier4
1RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan.
Abstract:
Electronic and crystal structures of Ce(Ru_{1-x}Rh_{x})_{2}Al_{10} have been studied using x-ray emission spectroscopy, photoelectron spectroscopy (PES), and x-ray diffraction. No structural phase transition was observed up to x=0.1, while the x-ray absorption spectra showed a Ce valence transition between x=0.03 and 0.05, accompanied by an increase in c-f hybridization strength, suggesting a Lifshitz transition. Angle-resolved PES conducted on the x=0.1 sample revealed stronger hybridization along the b axis compared to the other axes. Direction-dependent hybridization introduces complexity in applying conventional phase diagrams. For the first time, we propose a direction-dependent phase diagram for Ce(Ru_{1-x}Rh_{x})_{2}Al_{10}, advancing beyond the traditional Doniach phase diagram.
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