Abstract
Ce 5Si 3, which possesses two inequivalent Ce sites, Ce1 and Ce2, shows two anomalies in the magnetic susceptibility and specific heat, and a meta-magnetic jump in the magnetization curve. In order to reveal the origin of the two low temperature anomalies and the meta-magnetism, AC magnetic susceptibility and magnetization measurements have been performed on (Ce 1− x La x ) 5Si 2.69. By increasing x, the non-magnetic ground state in Ce2 changes into a magnetic one with ferromagnetic correlation at around x = 0.1. The antiferromagnetic (AF) ordering in Ce1 and the meta-magnetism suddenly disappear for x ≥ 0.1. These results suggest that the meta-magnetism is closely related with the AF ordering as well as the low-temperature anomalies.
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