Abstract
We have discovered that the NMR frequencies of Cu atoms which are near neighbors to Cr atoms in dilute CuCr have an anomalous temperature dependence. Comparison with data from CuMn and CuFe which display the normal temperature dependence of a Curie-Weiss law lead us to conclude that (a) Hirst is correct in his general picture that magnetic atoms have a d-shell configuration characteristic of a particular ionic state, (b) Cr and Mn appear to be divalent while Fe is monovalent, (c) there is a crystalline electric field at the site of the magnetic atom, but its sign is opposite of that proposed by Hirst, and (d) the Kondo temperature of CuCr is 2.9±1.0 K which is higher than most previously reported values.
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