Valence fluctuation and the temperature dependence of copper nuclear quadrupole interaction in EuCu<SUB>2</SUB>Si<SUB>2</SUB> and YbCu<SUB>2</SUB>Si<SUB>2</SUB>
- Sampathkumaran, E. V.
- Gupta, L. C.
- Vijayaraghavan, R.
DOIAbstract
The quadrupole interaction of copper has been measured as a function of temperature in EuCu2Si2 and YbCu2Si2. These measurements suggest that in these systems Hirst's "interconfiguration fluctuation" model provides a better description of the valence fluctuation than the localized-electron model. The observation of the influence of the valence-fluctuation phenomenon on the quadrupole interaction is reported for the first time and the importance of the NMR measurements on these materials is pointed out
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