Kondo anomalies of heat conductivity and Lorenz ratio in normal state (La,Ce) Al2 |
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Authors: | J. H. Moeser F. Steglich |
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Affiliation: | 1. II. Physikalisches Institut, Universit?t zu K?ln, Zülpicher Stra?e 77, D-5000, K?ln 41, Federal Republic of Germany
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Abstract: | The thermal conductivity of LaAl2 and of two dilute (La, Ce)Al2 alloys was measured in the normal state between 0.4 and 8 K. From the lattice conductivity of LaAl2 a high dislocation densityN d caused by the arc melting process can be inferred. After annealingN d is reduced by an order of magnitude. For the (La, Ce)Al2 samples minima are observed at 5 K in theW e ·T vs.T curves (W e =electronic thermal resistivity). Below 1 K the quantityW e ·T is linear in (— lnT). The electronic Lorenz ratioL e (T)=ρ(T)/W e (T) ·T shows a maximum at 2 K with a value 23% aboveL e (0). It is for the first time that this Kondo anomaly is established in its full temperature dependence. |
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