Temperature Dependence of Low-Energy Optical Conductivity of Yb<sub>4</sub>(As<sub>1-<i>x</i></sub>P<sub><i>x</i></sub>)<sub>3</sub> (<i>x</i> = 0, 0.05, 0.15)

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  • Kimura Shin-ichi
    Graduate School of Science and Technology, Kobe University, Nada-ku, Kobe 657-8501 PRESTO, Japan Science and Technology Corporation
  • Okuno Mitsuru
    Graduate School of Science and Technology, Kobe University, Nada-ku, Kobe 657-8501
  • Iwata Hideki
    Graduate School of Science and Technology, Kobe University, Nada-ku, Kobe 657-8501
  • Aoki Hidekazu
    Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresden, Germany
  • Ochiai Akira
    Center for Low Temperature Science, Tohoku University, Aoba-ku, Sendai 980-8578

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  • Temperature Dependence of Low-Energy Optical Conductivity of Yb4(As1-xPx)3 (x = 0, 0.05, 0.15).

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説明

To investigate the anomalous transport property and the electronic structure near the Fermi level of Yb4As3, we measured the temperature dependence of the reflectivity spectra of Yb4(As1-xPx)3 (x = 0, 0.05, 0.15) in the photon energy range of 2 meV-1.5 eV. The optical conductivity spectrum due to carrier absorption (Drude curve) significantly changes with temperature. Above 200 K, the Drude curve with a high effective carrier density (Neff) and a short relaxation time (τ) is commonly observed in all Yb4(As1-xPx)3. On the other hand, below 70 K, the Drude curve changes to one with a low Neff and a long τ below 10 meV. At the same temperature, a new peak appears at 15 meV in Yb4As3. The Drude curve and the new peak are considered to originate from the bare As 4p hole band and the hybridization state between the 4f and 5d bands on the Yb3+ chain, respectively.

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