Abstract
Antiferromagnetic ordered alloy Mn3Pt with a Cu3Au-type structure has a triangular spin structure (D phase) below Tt=365 K and a collinear one (F phase) between Tt and the Néel temperature TN(F)=475 K. The effect of carbon addition to Mn3Pt on magnetic properties is studied for Mn3PtCx by measuring the magnetic susceptibility and pressure effect on the magnetic transition temperatures. The results show that (1) the lattice parameter expands with x, (2) both Tt and TN(F) decrease with x, (3) Tt decreases and TN(F) increases with pressure, (4) the F phase disappears at high pressures. The P–T magnetic phase diagrams are presented.
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