Spin-Orbital Wave Excitations in Orbitally Degenerate Exchange Model with Multipolar Interactions
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概要
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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.
- Physical Society of Japanの論文
- 2001-10-15
著者
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Kusunose Hiroaki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kuramoto Yoshio
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Kuramoto Yoshio
Department of Physics, Tohoku University, Sendai 980-8578
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