Itinerant metamagnetic properties of MnSi under high pressures

Abstract

The magnetization of MnSi was measured under low temperature down to 1.2 K , high pressures up to 1.7 GPa and high magnetic fields up to 9 T . The magnetic transition at T C is second-order for P<1.2 GPa and first order for 1.2 GPa<P<1.54 GPa . The magnetic ordering vanishes for P>1.54 GPa . A metamagnetic transition is observed in the two high-pressure regions, 1.2 GPa<P<1.54 GPa and P>1.54 GPa . The B– T phase diagrams determined in the three regions are different from each other.