We studied the electronic structure of YbCdCu4, which is known as a heavy fermion compound, by means of photoe- mission spectroscopy. An energy shift and an intensity enhancement of the Yb2+ 4 f7/2 peak are clearly observed with decreasing temperature. The characteristic energy scale of the Kondo temperature is estimated as ~26.5 meV, which is in agreement with the Kondo temperature obtained by the magnetic susceptibility measurements. It suggests that the observed 4 f7/2 state is associated with the heavy fermion behavior of YbCdCu4.
Temperature dependence of the Kondo resonance peak in photoemission spectra of YbCdCu4
Hiroto Shiono, Suzuna Ishihara, Kojiro Mimura, Hitoshi Sato, Eike F. Schwier, Kenya Shimada, Masaki Taniguchi, Shin-ichiro Ideta, Kiyohisa Tanaka, Tao Zhuang, Keisuke T. Matsumoto, Koichi Hiraoka, Hiroaki Anzai; Temperature dependence of the Kondo resonance peak in photoemission spectra of YbCdCu4. AIP Conf. Proc. 15 January 2019; 2054 (1): 040013. https://doi.org/10.1063/1.5084614
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