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Specific heat of magnetic Ce alloys within a two-component model

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Abstract.

We propose a description of the electronic properties of Ce alloys as an inhomogeneous mixture of two components: one containing magnetic Ce ions with an RKKY interaction J H between them, and the other described as a collection of Kondo impurities with exchange interaction J K . Both J H and J K are assumed to depend on a composition parameter X, with a Gaussian distribution around a value X 0 (near to the expectation value of X), related to the experimental composition parameter x of the alloy. When the concentration of the Kondo impurities is large, the specific heat C displays non-Fermi liquid behavior over a wide temperature range. The main qualitative features of C/T as a function of temperature T observed in several Ce alloys are reproduced using simple J H (X) and J K (X) dependences.

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Correspondence to A. M. Lobos.

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Received: 28 July 2004, Published online: 21 October 2004

PACS:

75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena - 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)

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Lobos, A.M., Aligia, A.A. & Sereni, J.G. Specific heat of magnetic Ce alloys within a two-component model. Eur. Phys. J. B 41, 289–294 (2004). https://doi.org/10.1140/epjb/e2004-00319-2

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  • DOI: https://doi.org/10.1140/epjb/e2004-00319-2

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