TY - JOUR
T1 - Temperature dependence of low-energy optical conductivity of Yb 4(As 1-xP x) 3 (x = 0, 0.05, 0.15)
AU - Kimura, Shin Ichi
AU - Okuno, Mitsuru
AU - Iwata, Hideki
AU - Aoki, Hidekazu
AU - Ochiai, Akira
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2001/10
Y1 - 2001/10
N2 - 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.
AB - 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.
KW - Hybridization gap
KW - Optical conductivity
KW - Yb As
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U2 - 10.1143/JPSJ.70.2829
DO - 10.1143/JPSJ.70.2829
M3 - Article
AN - SCOPUS:0035634809
VL - 70
SP - 2829
EP - 2832
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 10
ER -