Abstract
Numerical calculations of the thermopower component Sd that is associated with the fine structure of the density of d states near the Fermi level are carried out for CeNi5 and its La analog. The estimates, together with earlier experimental data on the transport coefficients in Ce(MxNi1−x)5 solid solutions with M=Ga, Cu (0≤x≤0.4)), are used to analyze the behavior of the thermopower component Sf originating from the Ce valence instability. It is shown that as Ce crosses over from the state of its usual intermediate valence to the saturated-valence state, the feature near the Fermi energy, which represents a Lorentzian-shaped peak of the density of f states, transforms to a double-humped structure. The possibility of formation of a strongly correlated band of f states in Ce(MxNi1−x)5 in the crossover to the Ce saturated-valence state, accompanied by the opening of a quasi-gap Δ ∼ 400 K, is discussed.
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