Slow crossover in YbXCu4 intermediate valence compounds

Details Slow crossover in YbXCu4 intermediate valence compounds Slow crossover in YbXCu4 intermediate valence compounds

2000-06-08

arxiv.org/abs/cond-mat/0006147v2

Physical Review B 63, 054427 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to Physical Review B on June 7, 2000, accepted for publication November 2, 2000. Changes to the original manuscript

Scientific paper

10.1103/PhysRevB.63.054427

We compare the results of measurements of the magnetic susceptibility Chi(T), the linear coefficient of specific heat Gamma(T)=C(T)/T and 4f occupation number nf(T) for the intermediate valence compounds YbXCu4 (X = Ag, Cd, In, Mg, Tl, Zn) to the predictions of the Anderson impurity model, calculated in the non-crossing approximation (NCA). The crossover from the low temperature Fermi liquid state to the high temperature local moment state is substantially slower in the compounds than predicted by the NCA; this corresponds to the ''protracted screening'' recently predicted for the Anderson Lattice. We present results for the dynamic susceptibility, measured through neutron scattering experiments, to show that the deviations between theory and experiment are not due to crystal field effects, and we present x-ray-absorption fine-structure (XAFS) results that show the local crystal structure around the X atoms is well ordered, so that the deviations probably do not arise from Kondo Disorder. The deviations may correlate with the background conduction electron density, as predicted for protracted screening.

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