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

Journal Article · Sun Jul 15 00:00:00 EDT 2007 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776107070138· OSTI ID:21075810

Bogach, A V ^[1]; Burkhanov, G S ^[2]; Glushkov, V V; Demishev, S V ^[1]; Kuznetsov, A V ^[3]; Chistyakov, O D ^[2]; Shitsevalova, N Yu ^[4]; Sluchanko, N E ^[1]

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1. Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
2. Russian Academy of Sciences, Baikov Institute of Metallurgy and Materials Science (Russian Federation)
3. Moscow Engineering Physics Institute (State Technical University) (Russian Federation)
4. National Academy of Sciences of Ukraine, Institute for Problems of Materials Science (Ukraine)

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.

• OSTI ID: 21075810
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 105, Issue 1; Other Information: DOI: 10.1134/S1063776107070138; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BORON ALLOYS
CERIUM ALLOYS
CERIUM BORIDES
CHARGE CARRIERS
COPPER ALLOYS
EFFECTIVE MASS
FERMI LEVEL
FERMIONS
GOLD ALLOYS
INTERMETALLIC COMPOUNDS
MANY-BODY PROBLEM
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