Complex magnetic behavior in the antipolar phase of Bi1-La Fe1-Mn O3

We report a comprehensive structural and magnetic characterization of the Bi 0.75 La 0.25 Fe 0.75 Mn 0.25 O 3 perovskite, targeting the poorly understood intermediate doping regime of the Bi 1- x La x Fe 1- x Mn x O 3 system. X-ray and neutron powder diffraction reveal that the compound adopts an orthorhombic Pbam structure, analogous to that found in antiferroelectric PbZrO 3 . Analysis of the room-temperature neutron diffraction data identifies G-type antiferromagnetic ordering of Fe/Mn moments along the c -axis, with no evidence of a ferromagnetic component that could account for previously reported large spontaneous magnetization. Instead, a complex temperature-dependent evolution of the magnetic state is observed, involving a transition from a canted to a collinear antiferromagnetic configuration, followed by the reemergence of weak spontaneous magnetization at low temperatures.