Temperature dependence of low-energy optical conductivity of Yb 4(As 1-xP x) 3 (x = 0, 0.05, 0.15)

Shin Ichi Kimura, Mitsuru Okuno, Hideki Iwata, Hidekazu Aoki, Akira Ochiai

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2 Citations (Scopus)


To investigate the anomalous transport property and the electronic structure near the Fermi level of Yb 4As 3, we measured the temperature dependence of the reflectivity spectra of Yb 4(As 1-xP x) 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 (N eff) and a short, relaxation time (τ) is commonly observed in all Yb 4(As 1-xP x) 3. On the other hand, below 70 K, the Drude curve changes to one with a low N eff and a long τ below 10 meV. At the same temperature, a new peak appears at 15 meV in Yb 4As 3. 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 Yb 3+ chain, respectively.

Original languageEnglish
Pages (from-to)2829-2832
Number of pages4
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - 2001 Oct


  • Hybridization gap
  • Optical conductivity
  • Yb As

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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