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남균(Kyun Nahm),유상구(Sang Koo You),김철구(Chul Koo Kim) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.5
The elastic constants, C', of Th₃P₄-type structure compounds, La₃S₄ and Ce₃S₄, have been analyzed on the basis of band Jahn Teller mechanism. The distinct difference between two compounds lies in the fact that Ce³+ ion has a f electron which produces magnetism. It is shown that the band Jahn-Teller effect is sensitively influenced by the energy splitting of f electronic bands by a cubic crystal field in Ce₃S₄, and f electrons suppress the elastic softening effect. The energy splitting value obtained from the calculation of elastic constants is found to agree well with the experimental value obtained from the magnetic susceptibility measurement.