Dynamic magnetic response of LaMnGa0.5O3

The results of linear and non-linear magnetic AC susceptibility measurements are reported for polycrystalline LaMn0.5Ga0.5O3. The observation of an asymmetric peak in the linear AC response at 59 K, accompanied by the development of a sizeable second-harmonic component and of a double-peak third-harmonic signal, suggests the establishment of a long-range ordered magnetic ground state with unconventional dynamics. The results are compatible with a picture assuming a canted antiferromagnetic structure or the presence of ferromagnetic domains embedded in an antiferromagnetic matrix.