Studies of diluted antiferromagnets Mn_xMg_1-xTiO₃ with x=0.55 and 0.70 by muon spin relaxation method

Abstract

Longitudinal fields μSR measurements have been performed in order to probe the spin dynamics in the diluted antiferromagnets Mn_xMg_1-xTiO₃ with x=0.70 and 0.55. In the x=0.70 sample which forms the antiferromagnetic long‐range order, the static and fluctuating fields coexist at the muon stopping site below T_N. On the other hand, in the x=0.55 sample which shows the spin‐glass behavior, the local fields fluctuate rather fast even below T_SG. We infer that this drastic change occurs when Mn_xMg_1-xTiO₃ transforms from an antiferromagnetic system to a spin‐glass system by dilution.