The effect of temperature and excitation energy on Raman scattering in bulk HfS 2
Raman scattering (RS) in bulk hafnium disulfide ( HfS2 ) is investigated as a function of temperature (5 K - 350 K) with polarization resolution and excitation of several laser energies. An unexpected temperature dependence of the energies of the main Raman-active (A 1g and Eg) modes with the temper...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/349518 |
| Acceso en línea: | http://hdl.handle.net/10261/349518 |
| Access Level: | acceso abierto |
| Palabra clave: | Excitation energy dependence Phase transition Polarization resolved Raman scattering Raman scattering Temperature dependence Transition metal dichalcogenides |
| Sumario: | Raman scattering (RS) in bulk hafnium disulfide ( HfS2 ) is investigated as a function of temperature (5 K - 350 K) with polarization resolution and excitation of several laser energies. An unexpected temperature dependence of the energies of the main Raman-active (A 1g and Eg) modes with the temperature-induced blueshift in the low-temperature limit is observed. The low-temperature quenching of a mode ω 1 (134 cm-1) and the emergence of a new mode at approx. 184 cm-1, labeled Z, is reported. The optical anisotropy of the RS in HfS2 is also reported, which is highly susceptible to the excitation energy. The apparent quenching of the A 1g mode at T = 5 K and of the Eg mode at T = 300 K in the RS spectrum excited with 3.06 eV excitation is also observed. We discuss the results in the context of possible resonant character of light-phonon interactions. Analyzed is also a possible effect of the iodine molecules intercalated in the van der Waals gaps between neighboring HfS2 layers, which inevitably result from the growth procedure. |
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