Cluster-Glass Behavior of the Diluted Antiferromagnet Fe_<b>0.26</b>Zn_<b>0.74</b>F_<b>2</b>

Abstract

We measured the temperature variations of magnetizations and Mössbauer spectrum of the diluted antiferromagnet Fe 0.26 Zn 0.74 F 2 . We have shown that the temperature variation of the Mössbauer spectrum is nicely explained in an aspect of dynamical behavior of the antiferromagnetic (AF) clusters. By combining the results of the magnetization and Mössbauer measurements, we have inferred that the spin-glass like freezing occurs at T f =9.7 K not among individual spins but among the AF clusters. Therefore, we have concluded that Fe 0.26 Zn 0.74 F 2 is a cluster-glass system and should be distinguished from an ordinary spin-glass system.