Magnetic ordering of the CeFeSi-type La0.5Tb0.5MnSi compound

A neutron diffraction investigation has been carried out on the tetragonal CeFeSi-type (tP6, space group P4/nmm, No. 129-2) La0.5Tb0.5MnSi compound. The La0.5Tb0.5MnSi compound undergoes an antiferromagnetic ordering around 220(6) K followed by another antiferromagnetic ordering below 150(6) K. High-temperature transition corresponds to the antiferromagnetic ordering of manganese magnetic moments in the XY plane. Low-temperature magnetic transition corresponds to the antiferromagnetic ordering of terbium magnetic moments with orthorhombic distortion of initial tetragonal unit cell.