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Hill plot is a well-known criterion of the f-electron element interatomicthreshold-distance separating the nonmagnetic state from the magnetic one inactinides or lanthanides. We have reinvestigated the Hill plot of Ce compoundsusing a commercial crystallographic database CRYSTMET, focusing on arelationship between the Ce-Ce distance and the magnetic ordering temperature,because a Ce compound with no other magnetic elements scarcely has a magneticordering temperature higher than 20 K. The Hill plot of approximately 730compounds has revealed that a Ce compound, especially for ferromagnet, showingthe high magnetic-ordering-temperature would require a short Ce-Ce distancewith a suppression of valence instability of Ce ion. Through the study, we hadinterest in Ce2AuP3 with the Curie temperature of 31 K. The ferromagneticnature has been examined by a doping effect, which suggests a possible increaseof magnetic anisotropy energy.

Hill plot focusing on Ce compounds with high magnetic-ordering-temperatures and consequent study of Ce2AuP3