Pressure-induced optical anisotropy of HfS$_2$
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arXiv
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| author | Antoniazzi, Igor Woźniak, Tomasz Pawbake, Amit Zawadzka, Natalia Grzeszczyk, Magdalena Muhammad, Zahir Zhao, Weisheng Ibáñez, Jordi Faugeras, Clement Molas, Maciej R. Babiński, Adam |
| author_facet | Antoniazzi, Igor Woźniak, Tomasz Pawbake, Amit Zawadzka, Natalia Grzeszczyk, Magdalena Muhammad, Zahir Zhao, Weisheng Ibáñez, Jordi Faugeras, Clement Molas, Maciej R. Babiński, Adam |
| contents | The effect of pressure on Raman scattering (RS) in the bulk HfS$_2$ is investigated under hydrostatic and non-hydrostatic conditions. The RS lineshape does not change significantly in the hydrostatic regime, showing a systematic blueshift of the spectral features. In a non-hydrostatic environment, seven peaks emerge in the spectrum ($P$=7 GPa) dominating the lineshape up to $P$=10.5 GPa. The change in the RS lineshape manifests a pressure-induced phase transition in HfS$_2$. The simultaneous observation of both low-pressure (LP) and high-pressure (HP) related RS peaks suggests the corresponding coexistence of two different phases over a large pressure range. We found that the HP-related phase is metastable, persisting during the decompression cycle down to $P$=1.2 GPa with the LP-related features finally recovering at even lower pressures. The angle-resolved polarized RS (ARPRS) performed under $P$=7.4 GPa revealed a strong in-plane anisotropy of both the LP-related A$_{1g}$ mode and the HP peaks. The anisotropy is related to the possible distortion of the structure induced by the non-hydrostatic component of the pressure. We describe the obtained results by the influence of the non-hydrostatic pressure on the observed phase transition. We interpret our results in terms of a distorted $Pnma$ phase as a possible HP induced structure of HfS$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_19040 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pressure-induced optical anisotropy of HfS$_2$ Antoniazzi, Igor Woźniak, Tomasz Pawbake, Amit Zawadzka, Natalia Grzeszczyk, Magdalena Muhammad, Zahir Zhao, Weisheng Ibáñez, Jordi Faugeras, Clement Molas, Maciej R. Babiński, Adam Materials Science The effect of pressure on Raman scattering (RS) in the bulk HfS$_2$ is investigated under hydrostatic and non-hydrostatic conditions. The RS lineshape does not change significantly in the hydrostatic regime, showing a systematic blueshift of the spectral features. In a non-hydrostatic environment, seven peaks emerge in the spectrum ($P$=7 GPa) dominating the lineshape up to $P$=10.5 GPa. The change in the RS lineshape manifests a pressure-induced phase transition in HfS$_2$. The simultaneous observation of both low-pressure (LP) and high-pressure (HP) related RS peaks suggests the corresponding coexistence of two different phases over a large pressure range. We found that the HP-related phase is metastable, persisting during the decompression cycle down to $P$=1.2 GPa with the LP-related features finally recovering at even lower pressures. The angle-resolved polarized RS (ARPRS) performed under $P$=7.4 GPa revealed a strong in-plane anisotropy of both the LP-related A$_{1g}$ mode and the HP peaks. The anisotropy is related to the possible distortion of the structure induced by the non-hydrostatic component of the pressure. We describe the obtained results by the influence of the non-hydrostatic pressure on the observed phase transition. We interpret our results in terms of a distorted $Pnma$ phase as a possible HP induced structure of HfS$_2$. |
| title | Pressure-induced optical anisotropy of HfS$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2402.19040 |