Specific Heat of Dilute Cu(Fe) Alloys Far Below the Kondo Temperature

Abstract
Specific-heat data on the well-studied copper-iron Kondo alloy have been taken at temperatures down to 2×103TK, where the Kondo temperature TK20K. Results suggest a choice among current theoretical models of the quasibound state, and indicate the apparent existence of a significant amount of entropy at still lower temperatures.