Yb \(L_{3}\) Resonant Hard X-Ray Photoemission Spectroscopy of Valence Transition Compound YbInCu₄

Abstract

We have measured the Yb 3d 5/2 resonant hard x-ray photoemission spectra at the Yb L 3 edge of YbInCu 4 with the valence transition at T V = 42 K. The L 3 resonance effect in both Yb 2+ and Yb 3+ components in the Yb 3d 5/2 spectra is successfully observed at 70 and 20 K. We find that the feature of their constant initial state (CIS) spectra is described with the Fano profile. The feature of the CIS spectra is almost unchanged across T V .

On the Ytterbium Valence and the Physical Properties in Selected Intermetallic Phases

“…With lower temperature, the intensity of the divalent Yb increases, while the trivalent Yb decreases. The mean valence at 70 K is +2.91 and +2.67 at 20 K . Before this, investigation on Yb 0.5 In 0.5 Cu 2 via XPS measurements at 20 K and excitation energies of 90 to 500 eV also showed both species present in the spectra.…”

BL09XU: an advanced hard X-ray photoelectron spectroscopy beamline of SPring-8

“…In particular, resonant HAXPES reveals electronic structures with enhanced element-and valence-selectivity by scanning the incident X-ray energy near the X-ray absorption edges (Ikenaga et al, 2018). A typical target is the quantum critical phenomena of valence fluctuation through the 2p-5d resonant HAXPES of rare-earth compounds (Maeda et al, 2020). Furthermore, combining the polarization control of incident X-rays with the energy-scanning capability, one can also extract electron orbital symmetry (Fujiwara et al, 2016;Mori et al, 2014) and magnetic information (Ouardi et al, 2011;Kozina et al, 2011;Ueda et al, 2019).…”