MAGNON AND PHONON EXCITATIONS IN NANOSIZED NiO

被引：123
作者：
Mironova-Ulmane, N. [1 ]
Kuzmin, A. [1 ]
Sildos, I [2 ]
Puust, L. [2 ]
Grabis, J. [3 ]
机构：
[1] Univ Latvia, Inst Solid State Phys, 8 Kengaraga Str, LV-1063 Riga, Latvia
[2] Univ Tartu, Inst Phys, 1 Ostwaldi, EE-50411 Tartu, Estonia
[3] Riga Tech Univ, Inst Inorgan Chem, 3-7 P Valdena Str, LV-1048 Riga, Latvia
来源：
LATVIAN JOURNAL OF PHYSICS AND TECHNICAL SCIENCES | 2019年 / 56卷 / 02期
基金：
欧盟地平线“2020”;
关键词：
lattice dynamics; magnons; nickel oxide; nanoparticles; Raman spectroscopy; RAMAN-SCATTERING; LATTICE-DYNAMICS; NEUTRON-DIFFRACTION; MAGNETIC-MOMENTS; PARTICLE-SIZE; NICKEL-OXIDE; MNO; NANOPARTICLES; TEMPERATURE; DEPENDENCE;
D O I：
10.2478/lpts-2019-0014
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Single-crystal, microcrystalline and nanocrystalline nickel oxides (NiO) have been studied by Raman spectroscopy. A new band at similar to 200 cm(-1) and TO-LO splitting of the band at 350-650 cm(-1) have been found in the spectra of single-crystals NiO(100), NiO(110) and NiO(111). The Raman spectra of microcrystalline (1500 nm) and nanocrystalline (13-100 nm) NiO resemble those of the single crystals. They all contain the two-magnon band at 1500 cm(-1), indicating that the oxides remain at room temperature in the antiferromagnetic phase. Besides, a new sharp Raman band has been observed at 500 cm(-1) in nanocrystalline NiO. Its temperature dependence suggests the magnetic origin of the band, possibly associated with the one-phonon-one-magnon excitation at the Brillouin zone centre.
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页码：61 / 72
页数：12
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