Magnetic properties of Mn 2 Sb 1− x Ge x (0.05 ≤ x ≤ 0.2) in high magnetic fields

Magnetization and electrical resistivity measurements were carried out for polycrystalline Mn 2 Sb 1− x Ge x (0.05 ≤ x ≤ 0.2) in magnetic fields up to 16 T in the 4.2 − 600 K temperature range in order to investigate the magnetic and the electrical properties under high magnetic fields. Mn 2 Sb 0.92 Ge 0.08 showed a Curie temperature, T C , of 532 K and a first order magnetic transition from a ferrimagnetic (FRI) to an antiferromagnetic (AFM) phase at T t = 230 K with decreasing temperature in a zero magnetic field. With increasing x , T C decreased and T t increased. For Mn 2 Sb 0.92 Ge 0.08 , a matamagnetic transition from an AFM to a FRI phase was observed at 215 K. The magnetic phase diagram of Mn 2 Sb 1− x Ge x is presented.