Universal scaling in the dynamical conductivity of heavy fermion Ce and Yb compounds

• Published in: Journal of the Physical Society of Japan Vol. 76; no. 2; p. 23703
• Main Authors: OKAMURA, Hidekazu, WATANABE, Tatsuya, TAKABATAKE, Toshiro, NANBA, Takao, MATSUNAMI, Masaharu, NISHIHARA, Tomohisa, TSUJII, Naohito, EBIHARA, Takao, SUGAWARA, Hitoshi, SATO, Hideyuki, ONUKI, Yoshichika, ISIKAWA, Yosikazu
• Format: Journal Article
• Language: English
• Published: Tokyo Institute of Pure and Applied Physics 01-02-2007; Physical Society of Japan; The Physical Society of Japan
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic conduction in metals and alloys; Electronic transport in condensed matter; Exact sciences and technology; Physics; Scattering mechanisms and kondo effect; Ytterbium alloys; Cerium alloys; Scaling laws; Heavy fermions; Rare earth alloys; Dynamic properties; heavy fermion; Hybridization; Infrared spectra; Optical conductivity
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/jpsj.76.023703

Dynamical conductivity spectra [σ(ω)] have been measured for many heavy-fermion (HF) Ce and Yb compounds. A characteristic excitation peak has been observed in the infrared region of σ(ω) for all the compounds, and has been analyzed in terms of a simple model based on conduction (c)-f electron hybridized band. A universal scaling is found between the observed peak energies and the estimated c-f hybridization strengths of these HF compounds. This scaling demonstrates that the model of c-f hybridized band can generally and quantitatively describe the low-energy charge excitations in a wide range of HF compounds.