Magnetic dynamics and spin-phonon coupling in the antiferromagnet Ni2NbBO6

被引:22
|
作者
Prosnikov, M. A. [1 ]
Smirnov, A. N. [1 ]
Davydov, V. Yu. [1 ]
Pisarev, R. V. [1 ]
Lyubochko, N. A. [2 ]
Barilo, S. N. [2 ]
机构
[1] Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia
[2] Natl Acad Sci, Inst Solid State & Semicond Phys, Minsk 220072, BELARUS
基金
俄罗斯科学基金会;
关键词
2-MAGNON RAMAN-SCATTERING; LIGHT-SCATTERING; TEMPERATURE-DEPENDENCE; ENERGY FLUCTUATIONS; ABSORPTION; TRANSITION; CRYSTALS; EXCHANGE;
D O I
10.1103/PhysRevB.98.104404
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Antiferromagnetic systems with rich spin dynamics and pronounced interplay between magnetic and lattice degrees of freedom are of great interest in the emerging field of terahertz and subterahertz magnonics and spintronics. Here we report on spin and lattice dynamics of single crystals of Ni2NbBO6 studied with the use of polarized Raman spectroscopy in the temperature range of 10-300 K which includes the antiferromagnetic transition at T-N = 23.5 K. Well-defined and highly polarized magnetic excitations were observed below and partly above T-N. Three magnetic modes at 30, 84, and 113 cm(-1) (at T = 10 K) were detected. The two high-energy magnetic excitations were identified as two-magnon modes. In total, 57 out of the expected 60 Raman-active phonons were registered and identified. Several modes revealed a nontrivial spin-phonon coupling manifesting either hardening or softening mostly below T-N. The possible magnetic space groups were determined through symmetry analysis. Spin-wave spectra and density of states were calculated within the linear spin-wave theory for supporting the experimental findings.
引用
收藏
页数:11
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