Abstract
Abstract In each of the intermediate valent compounds EuNi 2 P 2 , EuPd 2 Si 2 , and EuPd 6 B 4 , the line width of the 151 Eu-Mossbauer resonance attains a maximum when its isomer shift varies most strongly with temperature. We associate this anomalous line broadening with a distribution of the local Eu valence, which may be described by an inhomogeneous width, Δ, of the interconfigurational excitation energy, E exc , in addition to the homogeneous fluctuation width, k B T f . Applying this model to the analysis of isomer shift, line width, and magnetic susceptibility, the model parameters Δ, E exc , and k B T f are obtained. Δ is found to attain maximal values at temperatures where E exc varies most steeply with temperature.
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