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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 occupationnumber 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 thenon-crossing approximation (NCA). The crossover from the low temperature Fermiliquid state to the high temperature local moment state is substantially slowerin the compounds than predicted by the NCA; this corresponds to the''protracted screening'' recently predicted for the Anderson Lattice. Wepresent results for the dynamic susceptibility, measured through neutronscattering experiments, to show that the deviations between theory andexperiment are not due to crystal field effects, and we presentx-ray-absorption fine-structure (XAFS) results that show the local crystalstructure around the X atoms is well ordered, so that the deviations probablydo not arise from Kondo Disorder. The deviations may correlate with thebackground conduction electron density, as predicted for protracted screening.Comment: Submitted to Physical Review B on June 7, 2000, accepted for  publication November 2, 2000. Changes to the original manuscript include: 1)  a discussion of the relation of the slow crossover to the conduction electron  density; 2) a discussion of the relation of the reported results to earlier  photoemission results; and, 3) minor editorial change

physical review. b, condensed matter

Slow crossover in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Yb</mml:mi><mml:mi>X</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(<b><i>X</i></b>=Ag, Cd, In, Mg, Tl, Zn) intermediate-valence compounds

Slow crossover inYbXCu4(X=Ag, Cd, In, Mg, Tl, Zn) intermediate-valence compounds