Abstract
We present phenomenological models calculations for the magnetic susceptibility, valence of Ce ions and the effective Bhor magneton number of Ce ion in CeCoSi system. We found that the susceptibility of this compound explained by the interconfiguration fluctuation (ICF) model. We obtain the valence of Ce ions 3.42 at the room temperature. This result suggests that CeCoSi system is a valence fluctuation system. We found the effective Bhor magneton number per atom 2.35 μB by the 2-state model which is close to the expected for a free Ce+3 ion.
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