Neutron Scattering from fcc Pr andPr3Tl

Abstract
Elastic-neutron-scattering measurements on the singlet-ground-state ferromagnets fcc Pr and Pr3 Tl are reported. Both exhibit magnetic phase transitions, possibly to a simple ferromagnetic state at 20 and 11.6 °K, respectively. The transitions appear to be of second order although that in fcc Pr is clearly anomalous. Additional information on the inelastic scattering studies of the Γ1Γ4 excitons in these systems is presented. dhcp Pr is also briefly discussed.