Abstract
Low Temperature resistivity and magnetization measurements on Au Yb alloys containing less than 3000 at.ppm of Yb will be briefly recalled. These showed that the Kondo temperature of the Γ7 ground-state is very low. They also allowed us to determine the magnitude of the crystalline field splitting from the superposed susceptibility observed in the high-field, low temperature part of the magnetization curves. New measurements of the dc-resistivity between 4–2 and 300 K show an anomalous increase which is approximatively logarithmic with temperature. This increase is attributed to the presence of a non-magnetic 5d virtual bound state at the Fermi level. This conclusion is similar to that made on the basis of thermoelectric power measurements.
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