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Magnon and Phonon Excitations in Nanosized NiO

Mironova-Ulmane, N. ; Kuzmin, A. ; Sildos, I. ; Puust, L. ; Grabis, J.

Latvian journal of physics and technical sciences, 2019-04, Vol.56 (2), p.61-72 [Periódico revisado por pares]

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Título:
Magnon and Phonon Excitations in Nanosized NiO
Autor: Mironova-Ulmane, N. ; Kuzmin, A. ; Sildos, I. ; Puust, L. ; Grabis, J.
Assuntos: Antiferromagnetism ; Brillouin zones ; Crystals ; Excitation ; lattice dynamics ; Magnons ; Nanocrystals ; nanoparticles ; nickel oxide ; Nickel oxides ; Phonons ; Raman spectra ; Raman spectroscopy ; Single crystals ; Spectrum analysis ; Temperature dependence
É parte de: Latvian journal of physics and technical sciences, 2019-04, Vol.56 (2), p.61-72
Descrição: Single-crystal, microcrystalline and nanocrystalline nickel oxides (NiO) have been studied by Raman spectroscopy. A new band at ~200 cm and TO-LO splitting of the band at 350–650 cm 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 , indicating that the oxides remain at room temperature in the antiferromagnetic phase. Besides, a new sharp Raman band has been observed at 500 cm 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.
Editor: Riga: Sciendo
Idioma: Inglês;Letão;Russo

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