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Martynov, A. S.
Quantum SU(3)-ferrimagnet on triangular lattice / A. S. Martynov, D. M. Dzebisashvili // J. Magn. Magn. Mater. - 2024. - Vol. 594. - Ст. 171906, DOI 10.1016/j.jmmm.2024.171906. - Cited References: 48. - The authors thanks professor V.V. Val’kov for original idea of this article, for his continuous interest and enormous contribution to this work . - ISSN 0304-8853. - ISSN 1873-4766
Кл.слова (ненормированные):
Quantum SU(3)-ferrimagnet -- Single-ion anisotropy -- Quadrupole ordering -- Triangular lattice
Аннотация: Manifestations of quantum effects in the macroscopic properties of frustrated magnets keep attracting considerable interest. We have formulated and studied a simple model of a three-sublattice mixed-spin (S=1,1/2,1/2) SU(3)-ferrimagnet on triangular lattice in which the strong quantum fluctuations are developed due to combined effect of frustrated exchange bonds, reduced dimensionality and a single-ion easy-plane anisotropy in the spin-1 sublattice. To account correctly for the SU(3) algebra, the Hubbard operators representation of generators is used. Dependencies of the magnetic moments R and RL (for spin-1/2 and spin-1 sublattices respectively), the total magnetic moment M, as well as the quadrupole moment, on the anisotropy parameter D are calculated at zero temperature and different ratios I/J of exchange integrals from different sublattices. It is established that for I/J≪1 the critical value Dc, at which the system enters the quadrupole antiferromagnetic phase, can be much smaller than both I and J. Besides, with an increase in D from zero to Dc the total moment M can change its direction several times via taking zero value. Classification of four branches of the spin-wave excitation spectrum of the SU(3)-ferrimagnet is carried out and modification of the spectrum with change in the single-ion anisotropy is analyzed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Мартынов, Александр Сергеевич
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