Abstract
Thermal and electron transport properties of the two Kondo compounds Ce2Ni3Ge5 and Ce3NiGe2 and of their nonmagnetic reference compounds La2Ni3Ge5 and La3NiGe2 were investigated by measurements of the thermoelectric power S, thermal conductivity κ, and electrical resistivity ρ. The effects of an applied magnetic field on the thermal and electron transport properties of both Ce compounds were examined. The temperature dependences of the 4f electron contribution to the electrical resistivity ρ4f, thermoelectric power S4f, and thermal resistivity W4f ·T exhibited −lnT behavior in two different temperature regions, which indicates that Ce2Ni3Ge5 and Ce3NiGe2 can be classified as Kondo systems with strong crystal-electric field (CEF) interactions. The total measured κ of Ce2Ni3Ge5 and Ce3NiGe2 was reduced compared with that of reference La compounds owing to the Kondo effect on Ce3+ ions. Within the framework of the Callaway model, the lattice component of thermal conductivity κph of both Ce compounds was analyzed while considering various relaxation processes governed by the scattering of phonons.
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