Pressure Effects on the Magnetic Phase Transition of Mn₃SnC_1?xN_x (x=0, 0.5)

The electronic transport properties of Mn₃SnC and Mn₃SnC_0.5N_0.5 were measured under pressures up to 1.8 GPa. At ambient pressure, an abrupt increase of resistance occurs around the temperature of magnetic phase transition in both samples. The transition temperature T_C from paramagnetic to ferrimagnetic state decreases linearly at rates of 12.6 and 6.3 K/GPa with pressure for Mn₃SnC and Mn₃SnC_0.5N_0.5, respectively. This phenomenon could be understood by the Labbe–Jardin tight binding approximation model.