Lattice dynamics and phase transitions in Fe\(_{3-x}\)GeTe\(_2\)

We present Raman spectroscopy measurements of the van der Waals bonded ferromagnet Fe\(_{3-x}\)GeTe\(_2\), together with lattice dynamics. Four out of eight Raman active modes are observed and assigned, in agreement with numerical calculations. The energies and line-widths of the observed modes disp...

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Bibliographic Details
Published in:arXiv.org 2019-06
Main Authors: Milosavljević, A, Šolajić, A, Djurdjić-Mijin, S, Pešić, J, Višić, B, Liu, Yu, Petrovic, C, Lazarević, N, Popović, Z V
Format: Article
Language:English
Subjects:
Ferromagnetism
Lattice vibration
Phase transitions
Raman spectroscopy
Temperature dependence
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Summary:We present Raman spectroscopy measurements of the van der Waals bonded ferromagnet Fe\(_{3-x}\)GeTe\(_2\), together with lattice dynamics. Four out of eight Raman active modes are observed and assigned, in agreement with numerical calculations. The energies and line-widths of the observed modes display an unconventional temperature dependence at about 150 K and 220 K, followed by the nonmonotonic evolution of the Raman continuum. Whereas the former can be related to the magnetic phase transition, the origin of the latter anomaly remains an open question.
ISSN:2331-8422
DOI:10.48550/arxiv.1906.07110