Lattice dynamics and phase transition in CrI$_3$ single crystals

A. Baum; A. \v{S}olaji\'c; C. Petrovic; J. Pe\v{s}i\'c; M. \v{S}\'cepanovi\'c; N. Lazarevi\'c; S. Djurdji\'c-Mijin; Y. Liu; Z. V. Popovi\'c

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Lattice dynamics and phase transition in CrI₃ single crystals

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arxiv 1807.03259 v1 pith:TNW46TEP submitted 2018-07-09 cond-mat.mtrl-sci

Lattice dynamics and phase transition in CrI₃ single crystals

S. Djurdji\'c-Mijin , A. \v{S}olaji\'c , J. Pe\v{s}i\'c , M. \v{S}\'cepanovi\'c , Y. Liu , A. Baum , C. Petrovic , N. Lazarevi\'c

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Z. V. Popovi\'c

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The vibrational properties of $\mathrm{CrI_3}$ single crystals were investigated using Raman spectroscopy and were analyzed with respect to the changes of the crystal structure. All but one mode are observed for both the low-temperature $R\bar{3}$ and the high-temperature C2/$m$ phase. For all observed modes the energies and symmetries are in good agreement with DFT calculations. The symmetry of a single-layer was identified as $p\bar{3}1/m$. In contrast to previous studies we observe the transition from the $R\bar{3}$ to the $\mathrm{C2}/m$ phase at 180\,K and find no evidence for coexistence of both phases over a wide temperature range.

Lattice dynamics and phase transition in CrI₃ single crystals

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