The γ-α transition in cerium compounds

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Abstract
The gamma - alpha transition and the related volume collapse are explained within a compressible Kondo lattice where the variation of mod J mod /D with volume is taken into account. The authors show that, contrary to the promotion model, the Kondo contribution is sufficient to induce a first-order transition at low temperature from a magnetic to a Kondo phase. The alpha phase is then characterised by an extremely high Kondo temperature. The calculations are also made at zero and finite temperatures and the existence of a critical point is demonstrated. Finally, they propose a generalisation to the effect of a chemical pressure. Applications are made to Ce, CeAl2 and Ce1-xThx.