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要旨:
We have investigated the electronic structure of YbZn1-xSnxCu4 with x =
0.5 by means of hard x-ray photoemission spectroscopy (HAXPES) with h nu
= 5.95 keV and low photon energy photoemission spectroscopy (LEPES) with
h nu = 14 eV. The Yb valence derived from the Yb 3d HAXPES spectrum
remarkably decreases between 100 and 20 K; similar to 2.90 at 300 - 100
K and 2.78 at 20 K. The LEPES spectra exhibit a prominent peak near the
Fermi level which is attributed to the Kondo resonance peak. The Kondo
temperature is estimated to be T-K similar to 210 K from an energy
position of the peak extrapolated to zero temperature.
