Spin glass behavior in Sr₂Mn_0.7Fe _0.3MoO₆

In this paper, we present a detailed study of the dc magnetization, ac susceptibility and aging effect in a polycrystalline Sr₂Mn _0.7Fe_0.3MoO₆ sample. Based on the tetragonal I 4/m space group, the XRD pattern is well refined, which shows that the sample is crystallized in a single phase double-perovskite structure without impurity phase. The dc magnetization, ac susceptibility, heat capacity, aging experiments and fitting results show the existence of the spin glass behavior in the sample. The spin glass behavior originates from the competition between the ferromagnetic and antiferromagnetic couplings due to the magnetic frustration at the interface of ferromagnetic and antiferromagnetic clusters in the phase separate sample.