Abstract
High-precision measurements of thermopower have been performed in a wide temperature range (2–300 K) for a series of cerium-based heavy-fermion compounds, including CeB6, CeAl3, CeCu6, and substitutional solid solutions of the CeCu6 − x Au x system (x = 0.1, 0.2). All compounds exhibit an unusual (logarithmic) asymptotic behavior of the temperature dependence of the Seebeck coefficient: S ∝ −lnT. In the case of cerium hexaboride, this anomalous behavior of S(T) is accompanied by the appearance of weak-carrier-localization-mode asymptotics in the conductivity (σ(T) ∝ T 0.39), while the paramagnetic susceptibility χ(T) and the effective mass of charge carriers m eff(T) vary according to a power law (χ(T), m eff(T) ∝ T −0.8) in the temperature interval T = 10–80 K. This behavior corresponds to renormalization of the density of states at the Fermi level. The observed anomalous behavior of thermopower in CeB6 and other cerium-based intermetallic compounds is attributed to the formation of heavy fermions (many-body states in the metal matrix) at low temperatures.
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Original Russian Text © M.I. Ignatov, A.V. Bogach, G.S. Burkhanov, V.V. Glushkov, S.V. Demishev, A.V. Kuznetsov, O.D. Chistyakov, N.Yu. Shitsevalova, N.E. Sluchanko, 2007, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 132, No. 1, pp. 69–72.
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Ignatov, M.I., Bogach, A.V., Burkhanov, G.S. et al. Anomalous thermopower in heavy-fermion compounds CeB6, CeAl3, and CeCu6 − x Au x . J. Exp. Theor. Phys. 105, 58–61 (2007). https://doi.org/10.1134/S1063776107070138
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DOI: https://doi.org/10.1134/S1063776107070138