Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 72, Issue 5, Pages 1216-1225Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.72.1216
Keywords
quadrupole; multipole; dynamics; excitation; magnetic field
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Excitations and neutron scattering spectra in the antiferro-quadrupolar ordering phase of CeB6 are studied theoretically. We develop a general formulation of the boson expansion method of multipoles and clarify the selection rules governing the multipolar dynamics. We apply the method to the RICKY model, which was introduced before for this material, and discuss the dispersions of excitation energies and their dependence on the magnetic field. Then neutron scattering spectra are calculated within the dipole approximation and compared quantitatively with the experiments by Bouvet. Possible interpretations of the peak structures in the observed spectra are discussed in connection with the characteristic multipolar interactions in CeB6.
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