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Abstract
The variations of the crystal field splitting energy Δ=E(Γ8)−E(Γ7) has been studied as a function of the composition x for the solid solution CeSb1−xTex in the whole range 0<x<1. Independent determinations of Δ from magnetic susceptibility and resistivity measurements were made. A nonlinear variation of Δ with x is evidenced with a maximum value of Δ≂+70 K at x=0.035 and a crossing between Γ7 and Γ8 levels at x∼0.10. A minimum value Δ∼−180 K is found for x=0.5. This behavior can be understood if we suppose that not only holes in the valence band, but also electrons in the conduction band mediate an indirect exchange between Ce ions. We have studied the properties of the fourth-order indirect exchange Hamiltonian in the mixing parameter derived from the Anderson model. The resulting magnetic interaction includes the long-range Cooper exchange and antiferromagnetic short-range interactions. An overall qualitative agreement is found between theory and the experimental results.
Published Version
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