Thermal conductivity of a moderate heavy-fermion compound YbIn0.2Ag0.8Cu4

The thermal conductivity κ and electrical resistivity ρ of a cast polycrystalline sample of YbIn0.2Ag0.8Cu4, which belongs to the class of moderate heavy-fermion compounds, are measured in the temperature range 5–300 K. It is shown that the phonon thermal conductivity of the sample follows an amorph...

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Bibliographic Details
Published in:Physics of the solid state 2006-04, Vol.48 (4), p.625-630
Main Authors: Golubkov, A. V., Parfen’eva, L. S., Smirnov, I. A., Misiorek, H., Mucha, J., Jezowski, A.
Format: Article
Language:English
Subjects:
Electrical resistivity
Fermions
Heat conductivity
Heat transfer
High temperature
Kondo temperature
Low temperature
Temperature dependence
Thermal conductivity
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Summary:The thermal conductivity κ and electrical resistivity ρ of a cast polycrystalline sample of YbIn0.2Ag0.8Cu4, which belongs to the class of moderate heavy-fermion compounds, are measured in the temperature range 5–300 K. It is shown that the phonon thermal conductivity of the sample follows an amorphous-like pattern throughout the temperature range covered, which should be assigned to the presence of Yb ions with a homogeneous mixed valence in this compound. The temperature dependence ρ(T) is divided into three portions: a high-temperature portion characteristic of conventional metals, a medium-temperature portion typical of Kondo compounds, and a low-temperature portion corresponding to a coherent Kondo lattice (the heavy-fermion regime). The Kondo temperature is estimated.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783406040032