Optical study of c–f hybridization states in mixed-valent Yb compounds: metallic YbAl₃ vs semiconducting YbB₁₂

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• 作者：Okamura ; H. ; Michizawa ; T. ; Matsunami ; M. ; Kimura ; S. ; Nanba ; T. ; Ebihara ; T. ; Iga ; F. ; Takabatake ; T.
• 关键词：71.27.+a ; 71.28.+d ; YbB₁₂ ; YbAl₃ ; c&ndash ; f hybridization ; Mixed valence ; Optical conductivity
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2004
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：May, 2004
• 卷：272-276
• 期：Supplement
• 页码：E51-E52
• 文件大小：187 K

摘要

We have measured the optical conductivity spectra σ(ω) of YbB₁₂ and YbAl₃, which are typical mixed-valent Yb compounds. The measured σ(ω) spectra in the mid-infrared region are quite similar for the two compounds, with a pronounced peak centered near 0.2eV. This result demonstrates that the Kondo semiconductor YbB₁₂ and the highly metallic YbAl₃ share very similar electronic structures near the Fermi level, in spite of their very different transport properties at low temperatures. This observation is discussed in terms of c–f hybridization states in these compounds.