The magnetization of single crystals of Eu, Sm, Nd, Pr, and Pr-Nd alloys has been measured in fields up to 37 T (370 kG). The results give new information on the magnetic properties of these metals. Of particular interest is a first-order transition from a nonmagnetic to a metamagnetic phase in double-hexagonal close-packed Pr, due to the crossing of crystal-field levels, when a field of about 32 T is applied in the hard direction at low temperatures.
McEwen, K. A., Cock, G. J., Roeland, L. W., & Mackintosh, A. R. (1973). High-Field Magnetization of Light Rare-Earth Metals. Physical Review Letters, 30(7), 287-290. https://doi.org/10.1103/PhysRevLett.30.287