https://doi.org/10.1140/epjb/e2004-00319-2
Specific heat of magnetic Ce alloys within a two-component model
Centro Atómico Bariloche and Instituto Balseiro, Comisión
Nacional de Energía Atómica, 8400 Bariloche,
Argentina
Corresponding author: a lobosa@cab.cnea.gov.ar
Received:
11
December
2003
Revised:
28
July
2004
Published online:
21
October
2004
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 JH between
them, and the other described as a collection of Kondo impurities with
exchange interaction JK.
Both JH and JK are assumed to depend on a
composition parameter X, with a Gaussian distribution around a
value X0 (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 
and 
dependences.
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.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
