Abstract

The EPR of ${\mathrm{Gd}}^{3+}$ impurities in the interconfiguration-fluctuation (ICF) host Ce${\mathrm{Pd}}_{3}$ is reported. The observed linewidth is consistent with an intrinsic relaxation rate proportional to $T$, where the proportionality constant is 3 times smaller than in the isostructural non-ICF host Y${\mathrm{Pd}}_{3}$. Although contrary to what is suggested by simple fluctuation concepts, such an effect of ICF on the EPR linewidth is actually to be expected theoretically.

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