Abstract
Nuclear spin relaxation of the 63Cu host nuclei in Cu(Cr) alloy is measured at temperatures below the Kondo temperature of this alloy (TK≃0.5°K). The results indicate that the many-body ground state of this system begins to break up, with both increasing temperature and increasing applied magnetic field, well below TK. The addition of 0.3 at.% Pt to one Cu(Cr) sample causes only a slight reduction of the many-body fluctuations in the ground state.
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