6533b82afe1ef96bd128b9df
RESEARCH PRODUCT
Phonons of hexagonal BN under pressure: Effects of isotopic composition
Julio Pellicer-porresAlfredo SeguraLluís ArtúsRamón CuscóJames H. EdgarJiahan Lisubject
Materials scienceSublinear functionPhonon02 engineering and technology01 natural sciencessymbols.namesakeRaman scattering experimentsCondensed Matter::Superconductivity0103 physical sciencesPhonomsGraphite010306 general physicsScalingCondensed matter physicsPhysical Systems021001 nanoscience & nanotechnologyTechniquesSemiconductorsRaman spectroscopyCompressibilitysymbolsvan der Waals forceGraphene0210 nano-technologyRaman spectroscopyRaman scatteringdescription
Raman scattering experiments on isotopically enriched hexagonal boron nitride have been performed under pressure up to 11 GPa at room temperature. The sublinear increase of the Raman-active E2g mode frequencies has been characterized. The pressure behavior has been analyzed by means of a bond-stiffness–bond-length scaling parameter γ which takes into consideration the vast differences in a- and c-axis compressibilities. The interlayer shear mode exhibits a γ parameter similar to that of graphite, and the mode frequency in isotopically pure samples separates faster at low pressures as a result of van der Waals interactions. Because of the extremely low a-axis compressibility, the intralayer mode exhibits a rather large scaling parameter. Within experimental uncertainties, no systematic departures related to isotopic mass have been observed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-02-25 |