The magnetic susceptibility of 248Cm metal

A SQUID-based micromagnetic susceptometer has been used to determine the magnetic susceptibility of 248Cm metal in the temperature range 4.2-340 K and in the applied magnetic field range of 0.45-1400 G. X-ray diffraction indicated that two of the samples of mass 37.2 and 41.2 μg exhibit the dhcp phase and one of mass 152 μg the fcc structure. The nominally dhcp samples exhibit an antiferromagnetic transition at approx. 65 K. A small second transition near 200 K is observed and influences the high temperature Curie-Weiss fit to the data. The fcc sample exhibits a ferromagnetic transition in the neighborhood of 200 K and at low temperature has a saturated magnetic moment per atom of 0.4 Bohr magnetons in applied fields above 1200 G. At high temperatures three interpretations of the susceptibility may be made. (orig./GSCH)