MAGNETIC EXCITATIONS IN PLUTONIUM MONOANTIMONIDE
Neutron inelastic scattering studies of uranium compounds have illustrated the complexity of the interactions in this part of periodic table. Recently, large crystals of plutonium compounds have been grown at the Transuranium Institute and we report here the first neutron inelastic scattering on PuSb. A monodomain sample of ferromagnetic PuSb was prepared by cooling in a field with H// (001). We observe an almost dispersionless magnetic transition, assigned to arise within the GAMMA-8 ground state, with an energy of 4.3 THz. Surprisingly, the lowest frequency (3.5 THz) excitation occurs at the zone boundary with a polarization along the wave vector. Theoretical predictions give the spin wave gap and GAMMA-8 + GAMMA-7 crystal field splitting (> 12 THz experimentally) but are presently unable to explain the lifting of the degeneracy of the longitudinal and transverse modes, and the minimum of the former at the zone boundary.
Bibliographic Reference: INTERNATIONAL CONFERENCE OF NEUTRON SCATTERING, SANTA FE, NEW MEXICO (USA), AUG. 19-23, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32447 ORA
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Record Number: 1989124044300 / Last updated on: 1987-01-01
Available languages: en