Abstract
The magnetic properties of CeSi which crystallizes in the FeB-type orthorhombic structure have been investigated. Experimental results indicate that CeSi is an antiferromagnet (${T}_{N}$=5.6 K) with interesting ground-state properties. Its ground-state magnetic moment attains a value of 1.47${\ensuremath{\mu}}_{B}$ in a field of 57 kOe at 3.0 K, which is far above the highest value ever observed for any Ce compound. The ground state surprisingly appears to be a quartet in spite of a noncubic crystal symmetry of this compound. Unlike other nearly trivalent Ce intermetallic compounds, no evidence for the Kondo effect is apparent in this compound.
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