Studies of Diluted Antiferromagnet Fe_<0.2>Mg_<0.8>TiO_3 : Percolation Concentration and Cluster-Glass

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The diluted antiferromagnet Fe_<0.2>Mg_<0.8>TiO_3 has been investigated. The temperature variation of magnetization exhibits the spin-glass (SG)-like behavior, and the SG-freezing temperature T_<sG> is estimated to be 6 K. On the other hand, the Mossbauer studies have demonstrated that the magnetically broadened spectrum appears superimposing upon the paramagnetic doublet already at 〜 14 K, and as the temperature decreases the magnetic spectrum increases in relative intensity accompanying the decrease of the line width. In order to analyze the Mossbauer spectra from the dynamical aspect, we applied the stochastic treatment of relaxation phenomena formulated by Blume. Combining the results of the magnetization and Mossbauer measurements, it has been concluded that the SG-freezing in Fe_<0.2>Mg_<0.8>TiO_3 occurs among the "AF clusters" but not among individual spins.
社団法人日本物理学会の論文
1995-05-15