MAGNETISM IN NEODYMIUM AT HIGH-PRESSURE

We have carried out magnetic neutron diffraction studies of a single c rystal of neodymium at high pressure, using clamp cells on the diffrac tometer D10 at the Institut Laue-Langevin, Grenoble. The magnetic orde ring was investigated at pressures up to 14 kbar in the temperature ra nge 1.4-25 K. A number of quite different magnetic phases were observe d, including the coexistence of ferromagnetic and antiferromagnetic or dering of moments on the inequivalent crystallographic sites. The stru ctures formed and the population of the different symmetrically equiva lent domains appear to be affected by complex interactions between the cubic-site ferromagnetism, the antiferromagnetic hexagonal-site order ing and a uniaxial component of stress.