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 .
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