Spin-orbital wave excitations in orbitally degenerate exchange model with multipolar interactions

Hiroaki Kusunose, Yoshio Kuramoto

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Elementary excitations in the multipole ordered state, which models the phase III in CeB6, are investigated by means of a generalized Holstein-Primakoff formalism. When different kinds of nearest-neighbor exchange interactions between multipoles are comparable to each other, orbital-flip excitations exhibit almost one-dimensional dispersion along the kz axis. With high symmetry of the interactions, zero modes appear due to the macroscopic degeneracy of the ground state. The next-nearest-neighbor Γ4u2-type interaction, which stabilizes the magnetic order of the phase III in CeB6, lifts the degeneracy and leads to gapfull excitation spectrum. When the next-nearest-neighbor Γ5u-type interaction exists simultaneously, the spectrum shows softening at Γ and Z points. These excitations may be probed by neutron scattering and ultrasonic measurements.

Original languageEnglish
Pages (from-to)3076-3083
Number of pages8
Journaljournal of the physical society of japan
Volume70
Issue number10
DOIs
Publication statusPublished - 2001 Oct 1

Keywords

  • CeB
  • Holstein-Primakoff transformation
  • Multipole moment
  • Orbital degeneracy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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