Selected Properties of Lattice Dynamics of HgSe and β-HgS |
| W. Szuszkiewicz, K. Dybko, E. Dynowska, J. Górecka, B. Witkowska Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland B. Hennion Laboratoire Léon Brillouin, CE Saclay, 91191 Gif-sur-Yvette cédex, France M. Jouanne and C. Julien Laboratoire de Milieux Désordonnés et Hétérogènes, Université Pierre et Marie Curie, Case 86, 4, place Jussieu, 75252 Paris cédex 05, France |
| Full Text PDF |
| Optical phonon dispersion for β-HgS was measured by the neutron scattering for the first time. The results confirmed theoretically predicted anomalous behavior of phonon modes in this material, resulting probably from high ionicity of mercury sulphide and large difference of Hg and S atomic mass. Influence of the isotopic effects on the TO-phonon mode for HgSe and HgS is analyzed. The possible observation of such effects in IR reflectivity spectra taken for HgSe at low temperature is discussed. |
| DOI: 10.12693/APhysPolA.92.1029 PACS numbers: 61.12.-q, 63.20.-e, 78.30.-j |