Anomalous thermopower in heavy-fermion compounds CeB{sub 6}, CeAl{sub 3}, and CeCu{sub 6-x}Au{sub x}

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 CeB{sub 6}, CeAl{sub 3}, CeCu{sub 6}, and substitutional solid solutions of the CeCu{sub 6-x}Au{sub x} system (x = 0.1, 0.2). All compo...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2007-07, Vol.105 (1)
Main Authors: Ignatov, M. I., Bogach, A. V., Burkhanov, G. S., Glushkov, V. V., Demishev, S. V., Kuznetsov, A. V., Chistyakov, O. D., Shitsevalova, N. Yu, Sluchanko, N. E.
Format: Article
Language:English
Subjects:
ALUMINIUM ALLOYS
BORON ALLOYS
CERIUM ALLOYS
CERIUM BORIDES
CHARGE CARRIERS
COPPER ALLOYS
EFFECTIVE MASS
FERMI LEVEL
FERMIONS
GOLD ALLOYS
INTERMETALLIC COMPOUNDS
MANY-BODY PROBLEM
MATERIALS SCIENCE
PARAMAGNETISM
RENORMALIZATION
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
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Summary: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 CeB{sub 6}, CeAl{sub 3}, CeCu{sub 6}, and substitutional solid solutions of the CeCu{sub 6-x}Au{sub x} system (x = 0.1, 0.2). All compounds exhibit an unusual (logarithmic) asymptotic behavior of the temperature dependence of the Seebeck coefficient: S {proportional_to} -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 ({sigma}(T) {proportional_to} T{sup 0.39}), while the paramagnetic susceptibility {chi}(T) and the effective mass of charge carriers m{sub eff}(T) vary according to a power law ({chi}(T), m{sub eff}(T) {proportional_to} T{sup -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 CeB{sub 6} and other cerium-based intermetallic compounds is attributed to the formation of heavy fermions (many-body states in the metal matrix) at low temperatures.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776107070138