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Abstract
We have investigated the electronic structure of YbZn1-xSnxCu4 with x &equal; 0.5 by means of hard x-ray photoemission spectroscopy (HAXPES) with hv &equal; 5.95 keV and low photon energy photoemission spectroscopy (LEPES) with hv &equal; 14 eV. The Yb valence derived from the Yb 3d HAXPES spectrum remarkably decreases between 100 and 20 K; ~ 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 TK ~ 210 K from an energy position of the peak extrapolated to zero temperature.
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1 Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-0046, Japan
2 Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
3 Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
4 Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan
5 Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Hyogo 679-5148, Japan; Quantum Beam Unit, National Institute for Materials Science, Tsukuba 305-0047, Japan
6 Quantum Beam Unit, National Institute for Materials Science, Tsukuba 305-0047, Japan
7 Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-0046, Japan; Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan