RT info:eu-repo/semantics/article
T1 Pressure‐Raman study of resonant TO(Γ)–two‐phonon decay processes in ZnS: Comparison of three isotope compositions
A1 Tallman, R. E.
A1 Cantarero, A.
A1 Garro, N.
A1 Lauck, R.
A1 Ritter, T. M.
A1 Weinstein, B. A.
A1 Cardona, M.
A1 Serrano Gutiérrez, Jorge
AB Pressure-Raman studies (to 15 GPa, at 300 K and 16 K) are reported on 64Zn34S, 68Zn32S, and natural ZnS to compare the effects of resonant 3-phonon mixing on the TO(Γ) phonons for the different isotope compositions. Under pressure the TO(Γ) Raman profiles exhibit several distinct features, and a sharp Lorentzian TO(Γ) peak eventually emerges at a threshold pressure PTh that differs for each isotope composition. These effects are due to resonant mixing of the TO(Γ) phonon with TA + LA combination modes. Calculations based on a bond-charge model and perturbation theory reproduce the observed pressure variations in the shape and the width of the TO(Γ) peaks. It is shown that these changes relate to singularities in the TA + LA density of states. Mass scaling of the TO(Γ) and TA + LA modes explains the isotope effect on PTh, and leads to the estimate γLA(W) ∼1.2
PB Wiley
SN 0370-1972
YR 2004
FD 2004
LK https://uvadoc.uva.es/handle/10324/65332
UL https://uvadoc.uva.es/handle/10324/65332
LA eng
NO phys. stat. sol. (b) 241, No. 14, 3143 – 3148 (2004)
DS UVaDOC
RD 23-nov-2024