Nuclear Spin Relaxation in Cu(Cr): An Attempt to Suppress the Kondo Effect

Abstract

Nuclear spin relaxation of the ⁶³Cu host nuclei in Cu(Cr) alloy is measured at temperatures below the Kondo temperature of this alloy (T_K≃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 T_K. 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.