Abstract
Measurements of magnetic susceptibility specific heat Hall coefficient and Yb valence -occupation number determined from Yb x-ray absorption measurements] were carried out on single crystals of The low-temperature anomalies observed in and corresponding to an energy scale in the intermediate valence, Kondo lattice compound are suppressed by Lu concentrations as small as 5% suggesting these low- anomalies are extremely sensitive to disorder and, therefore, are a true coherence effect. By comparing the temperature dependence of various physical quantities to the predictions of the Anderson impurity model, the slow crossover behavior observed in in which the data evolve from a low-temperature coherent, Fermi-liquid regime to a high-temperature local moment regime more gradually than predicted by the Anderson impurity model, appears to evolve to fast crossover behavior at where the evolution is more rapid than predicted. These two phenomena found in i.e., the low- anomalies and the slow/fast crossover behavior are discussed in relation to recent theories of the Anderson lattice.
- Received 6 October 2003
DOI:https://doi.org/10.1103/PhysRevB.69.125102
©2004 American Physical Society