Lattice dynamics in FeSi measured by inelastic x-ray scattering

G. A. Valkovskiy, A. A. Mistonov, M. B. Smirnov, S. V. Grigoriev

Research outputpeer-review

Abstract

The phonon dispersion of FeSi was measured by inelastic x-ray scattering. The study of its temperature evolution in the range of 100 K-300 K showed that the phonon modes soften to a different extent. The phonons exhibiting specifically strong softening were revealed to belong to the weakly dispersive optical branch. At the same time, the calculations of the lattice dynamics of FeSi suggest that this branch corresponds mainly to the atomic displacements that change the Fe-Fe nearest neighbor distance. It points to the role of the Fe-Fe interaction in the phonon softening.

Original languageEnglish
Article number265402
JournalJournal of Physics Condensed Matter
Volume31
Issue number26
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Lattice vibrations
Phonons
x ray scattering
softening
inelastic scattering
Scattering
X rays
phonons
Temperature
interactions
temperature

Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Lattice dynamics in FeSi measured by inelastic x-ray scattering",
abstract = "The phonon dispersion of FeSi was measured by inelastic x-ray scattering. The study of its temperature evolution in the range of 100 K-300 K showed that the phonon modes soften to a different extent. The phonons exhibiting specifically strong softening were revealed to belong to the weakly dispersive optical branch. At the same time, the calculations of the lattice dynamics of FeSi suggest that this branch corresponds mainly to the atomic displacements that change the Fe-Fe nearest neighbor distance. It points to the role of the Fe-Fe interaction in the phonon softening.",
keywords = "FeSi, Inelastic x-ray scattering, Interatomic distances, Phonon",
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language = "English",
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Lattice dynamics in FeSi measured by inelastic x-ray scattering. / Valkovskiy, G. A.; Mistonov, A. A.; Smirnov, M. B.; Grigoriev, S. V.

In: Journal of Physics Condensed Matter, Vol. 31, No. 26, 265402, 01.01.2019.

Research outputpeer-review

TY - JOUR

T1 - Lattice dynamics in FeSi measured by inelastic x-ray scattering

AU - Valkovskiy, G. A.

AU - Mistonov, A. A.

AU - Smirnov, M. B.

AU - Grigoriev, S. V.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The phonon dispersion of FeSi was measured by inelastic x-ray scattering. The study of its temperature evolution in the range of 100 K-300 K showed that the phonon modes soften to a different extent. The phonons exhibiting specifically strong softening were revealed to belong to the weakly dispersive optical branch. At the same time, the calculations of the lattice dynamics of FeSi suggest that this branch corresponds mainly to the atomic displacements that change the Fe-Fe nearest neighbor distance. It points to the role of the Fe-Fe interaction in the phonon softening.

AB - The phonon dispersion of FeSi was measured by inelastic x-ray scattering. The study of its temperature evolution in the range of 100 K-300 K showed that the phonon modes soften to a different extent. The phonons exhibiting specifically strong softening were revealed to belong to the weakly dispersive optical branch. At the same time, the calculations of the lattice dynamics of FeSi suggest that this branch corresponds mainly to the atomic displacements that change the Fe-Fe nearest neighbor distance. It points to the role of the Fe-Fe interaction in the phonon softening.

KW - FeSi

KW - Inelastic x-ray scattering

KW - Interatomic distances

KW - Phonon

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