Observation of an itinerant metamagnetic transition in MnSi under high pressure

Magnetization measurements have been performed on single-crystalline MnSi u nder high pressures up to 1.54 GPa and high magnetic fields up to 10 T in t he temperature range from 1.7 to 60 K. The magnetization process exhibits n o hysteresis in the pressure region up to 1.34 Cpa. At P=1.54GPa, we have c learly observed a metamagnetic transition around B=0.1 T with hysteresis in the magnetization process at low temperatures below 6 K. From the: experim ental results, we have determined the magnetic phase diagram of MnSi for P= 1.54 GPa.