Abstract
We have performed 29 Si NMR measurement in Ce(La–Y)Ru 2 Si 2 compounds with Ce being partialy substituted by La or Y in order to probe the Ce spin fluctuations in this Kondo system. From NMR relaxation time and Knight shift measurements the thermal dependence of the electronic relaxation rate \(\varGamma\) is deduced for compound with T K varying between 9 K–80 K as deduced from specific heat measurement. We show that the spin fluctuation rate \(\varGamma\) scales with T K and obeys a universal thermal behavior \(\varGamma/T_{\text{K}}{=}f(T/T_{\text{K}})\). This universal curve is qualitatively compared with theoretical result. A possible agreement is found between experiment and theory for a two fold degeneracy at T =0 and a four fold degeneracy at moderated high temperature ( T <300 K) consistent with the crystal field splitting in this tetragonal compound.
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