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.

引用

页码：61 / 72

页数：12

共 62 条

[21] Magnetic moments at the surface of antiferromagnetic NiO(100) [J].