Abstract
We have measured the temperature dependence of the Hall coefficient R H(T) in CeAl 3, Ce 0.8La 0.2Al 3 and CeCu 2Si 2 down to temperature T≲ 0.2K with a view to confirming that the strong decrease of R H(T) below T ≅ 2K seen in pure CeAl 3 is associated with the periodicity of the Kondo Lattice. We find that partial substitution of La for Ce in CeAl 3 largely suppresses this decrease. This indicates that the low temperature decrease in the Hall coefficient in nonmagnetic Kondo lattices is caused by the transition to the coherent scattering regime in a periodic array of Kondo centres. Our CeCu 2Si 2 sample was not superconducting down to T = 0.04K and also showed a much smaller decrease in R H(T) at low temperatures.
Published Version
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