Thermopower of CexR1-xB6 (R=La, Pr and Nd)

Details Thermopower of CexR1-xB6 (R=La, Pr and Nd) Thermopower of CexR1-xB6 (R=La, Pr and Nd)

2006-04-25

arxiv.org/abs/cond-mat/0604582v1

Physics

Condensed Matter

Strongly Correlated Electrons

PDF file, 7 pages with 9 figures, accepted for publication

Scientific paper

10.1143/JPSJ.75.064704

The thermopower, S, of CexR1-xB6 (R=La, Pr, Nd) was investigated. S with a positive sign shows a typical behavior observed in the Ce Kondo system, an increase with decreasing temperature at high temperatures and a maximum at low temperatures. The S values of all the systems at high temperatures are roughly linearly dependent on the Ce concentration, indicating the conservation of the single-impurity character of the Kondo effect in a wide x range. However, the maximum value of S, S_max, and the temperature, T_max, at which S_max is observed exhibit different x dependences between CexLa1-xB6 and CexR1-xB6 (R=Pr, Nd). In CexLa1-xB6, T_max, which is ~8 K in CeB6, decreases with decreasing x and converges to ~1 K in a very dilute alloy and S_max shows an increase below x ~ 0.1 after decreasing with decreasing x. In CexR1-xB6 (R=Pr, Nd), T_max shows a weak x dependence but S_max shows a roughly linear decrease in x. These results are discussed from the standpoint of the chemical pressure effect and the Ce-Ce interaction. S in the long-range ordered phase shows very different behavior between CexPr1-xB6 and CexNd1-xB6.

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