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Zusammenfassung:
We have investigated the Ce valence of an intermetallic compound Ce2Rh2Ga with a phase transition at T-t = 128.5 K by means of high-energy resolution fluorescence-detected x-ray absorption spectroscopy (HERFDXAS) and resonant x-ray emission spectroscopy (RXES) around the Ce L-3 edge. The HERFD-XAS spectra in the whole temperature range from 300 to 3 K exhibit weak f(0) (Ce4+) and f(2) (Ce2+) peaks as well as the f(1) (Ce3+) main peak, indicating that the Ce 4f electrons hybridize with the conduction electrons. With decreasing temperature from 125 to 100 K across Tt, the f(1) peak is reduced, while the f(0) peak is enhanced. Concomitantly, the Ce L alpha(1) RXES intensity taken at the f(2) peak of the HERFD-XAS spectrum decreases. These spectroscopic results indicate that the phase transition at Tt of Ce2Rh2Ga is driven by a valence transition of the Ce ions.
