TEMPERATURE-DEPENDENT HIGH-RESOLUTION PHOTOEMISSION SPECTROSCOPY OFYbXCu4(X=In, Cd, Mg)

H. Sato, Y. Nishikawa, F. Nagasaki, H. Fujino, Y. Takeda, M. Arita, K. Shimada, H. Namatame, A. Kimura, M. Taniguchi, K. Hiraoka and K. Kojima
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H. Sato: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
Y. Nishikawa: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
F. Nagasaki: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
H. Fujino: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
Y. Takeda: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
M. Arita: Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-8526, Japan
K. Shimada: Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-8526, Japan
H. Namatame: Hiroshima Synchrotron Radiation Center, Hiroshima University, Kagamiyama 2-313, Higashi-Hiroshima 739-8526, Japan
A. Kimura: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
M. Taniguchi: Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan;
K. Hiraoka: Faculty of Engineering, Ehime University, Bunkyo-cho 3, Matsuyama 790-8577, Japan
K. Kojima: Faculty of Integrated Arts and Sciences, Hiroshima University, Kagamiyama 1-7-1, Higashi-Hiroshima 739-8521, Japan

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 1079-1083

Abstract: Valence-band and Yb 4d photoemission spectra ofYbXCu4(X=In, Cd, Mg) have been measured with high energy resolution from 10 to 300 K. In the valence-band photoemission spectra ofYbInCu4andYbCdCu4, the structure due to theYb2+4f7/2states is clearly observed near the Fermi level(EF)at 10 K. The intensity of theYb2+4f7/2structure decreases with increasing temperature and the structure almost disappears at 300 K. The amount of the enhancement from 50 to 107 K is much stronger forYbInCu4than forYbCdCu4. On the other hand, theYb2+4f7/2structure ofYbMgCu4is observed as a broad peak nearEFand the spectra show little temperature dependence. In the Yb 4d photoemission spectra ofYbInCu4andYbCdCu4, the structures due to theYb2+andYb3+states are recognized. The intensity ratioYb2+/Yb3+increases with decreasing temperature. In the Yb 4d spectra ofYbMgCu4, on the other hand, almost only structures due toYb2+states are observed.

Date: 2002
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DOI: 10.1142/S0218625X02003378

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