Magnetic Properties of Orthorhombic Perovskite Ho 1− x La x MnO 3

Single phase orthorhombic perovskite Ho1?xLaxMnO3 (x = 0.1, 0.15) compounds are successfully synthesized by using a sol-gel method. We find that the orthorhombic perovskite structure of HoMoO3 compound can be stabilized by partial substitution of smaller Ho ion by larger La ion. The magnetic properties of orthorhombic perovskite Ho1?xLaxMnO3 are investigated for the first time. For the x = 0.15 sample, a ferromagnetic-like transition is found around T = 130 K, which should correspond to partial FM ordering of Mn3+ magnetic moments. The partial substitution of Ho by La causes a switch of magnetic state of Mn3+ moments from AFM order to FM-like order. Our study indicates that La doping has significant influence on the magnetic structures of Mn ions.