Kondo effect of trivalent Tm in Y_0.9Tm_0.1S

The existence of a Kondo effect in a trivalent alloy Y0.9Tm0.1 S is shown by the Curie-Weiss behavior of the susceptibility and by a ln T decrease of Δρ{variant} = ρ{variant}alloy - ρ{variant}YS above ∼ 12 K comparable with that observed in TmS. Comparisons are made with the Kondo dilute alloys of the intermediate valent system (Y,Tm)Se. © 1983.