Magnetic transition and critical point in the MnFeAs/sub y/P/sub 1-y/ system

The magnetization of a MnFeAs/sub y/P/sub 1-y/ system for y=0.275 and y=0.30 is measured under a static magnetic field up to 28 T at temperatures from 4.2 to 400 K. Field induced phase transitions are observed, and the critical points are found on (B, T) phase diagrams. In the case of y=0.275, the pressure measurements of magnetic phase transition temperatures are also reported.<
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