Mossbauer Study on the Magnetism of Trinuclear Complex Salts

概要

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A susceptibility measurement on [Fe_3O(CH_3COO)_6(H_2O)_3]Cl・6H_2O at temperatures between 4.2 K and 1.3 K shows that the triangular Fe^<3+>-clusters have spin 1/2 in the ground state owing to strong antiferromagnetic intracluster interactions. The Mossbauer spectrum of this salt in the external field of 50 kOe at 1.5 K consists of three sets of magnetically split patterns with the effective fields of 210 kOe, 175 kOe and 80 kOe, respectively. The spectrum from the (Cr_2Fe)-clusters in the isomorphous Cr-salt with Fe^<57> substituting for Cr^<3+> ions up to 2% has a single pattern with the effective field of 235 kOe. It is shown that antiferromagnetic intracluster interactions cause the constituent Fe^<3+> (and Cr^<3+>) ions to have small positive or negative spin components along the large polarizing field. The three interactions in an Fe-cluster are not equivalent to each other. For a (Cr_2Fe)-cluster, the Fe^<3+>-Cr^<3+> interactions are stronger than the Cr^<3+>-Cr^<3+> one.
社団法人日本物理学会の論文
1972-11-05