Magnetic Field-Induced Phase Transitions in Fe2-xMnxAs

Magnetization process of the intermetallic compound Fe 2- x Mn x As is investigated under a high magnetic field up to 560 kOe with a special interest in the metamagnetic behaviors both in the antiferromagnetic and ferrimagnetic states. Two kinds of stepwise transitions are found and the observed field-induced transitions are attributed to the step magnetizations of the site-I moment where two kinds of magnetic instabilities appear under a high magnetic field. The moment increases of Fe and Mn spins of two metamagnetic states are quantitatively determined.