Electrical and thermal transport properties of the alloy system (Ce1-xLax)Cu4In

International Conference on Strongly Correlated Electron Systems 2014

Bashir, Aiman K.^1 ; Tchokonté, Moise B. Tchoula^1 ; Britz, Douglas^2 ; Sondezi, B.M.^3 ; Strydom, André M.^2 ; Kaczorowski, Dariusz^3

Department of Physics, University of the Western Cape, Private Bag X 17, Bellville

7535, South Africa^1

Highly Correlated Matter Research Group, Department of Physics, University of Johannesburg, PO Box 524, Auckland Park

2006, South Africa^2

Institute of Low Temperature and Structure Research, Polish Academy of Sciences, PO Box 1410, Wroclaw

50-950, Poland^3

关键词: Dimensionless figure of merit;    High temperature;    Kondo scattering;    Lorentz numbers;    Low temperatures;    Powder X ray diffraction;    Resonance model;    Thermal transport properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012004/pdf
DOI  :  10.1088/1742-6596/592/1/012004

来源: IOP

【 摘 要 】

The studies of electrical resistivity, ρ(T), magnetoresistivity, MR, thermoelectric power, S(T) and thermal conductivity, λ(T), of the alloy system (Ce1-xLax)Cu4In (0 ≤ x ≤ 1) are reported. The room temperature powder X-ray diffraction studies confirm the orthorhombic CeCu4.38ln1.62-type crystal structure with space group Pnnm (No. 58) for all investigated compositions across the series. ρ(T) results indicate an evolution from coherent Kondo scattering to incoherent single-ion Kondo scattering, with increased La content x. ρ(T) for each composition at high temperature is described by a -ln(T) behaviour. MR measurements on Ce dilute alloys are interpreted within the single-ion Bethe ansatz description of the Coqblin-Schrieffer model. S(T) results are described by the phenomenological resonance model. λ(T) data increase linearly with temperature from low T and shows a tendency toward saturation above 300 K for dilute Ce alloys. The Lorentz number, L/L0and the dimensionless figure of merit, ZT= S2T/λρ increase upon cooling and exhibit maxima at low temperatures.