Much recent attention has been devoted towards unravelling the microscopic optoelectronic properties of hybrid organic-inorganic perovskites (HOP). Here we investigate by coherent inelastic neutron scattering spectroscopy and Brillouin light scattering, low frequency acoustic phonons in four different hybrid perovskite single crystals: MAPbBr3, FAPbBr3, MAPbI3 and α-FAPbI3 (MA: methylammonium, FA: formamidinium). We report a complete set of elastic constants caracterized by a very soft shear modulus C44. Further, a tendency towards an incipient ferroelastic transition is observed in FAPbBr3. We observe a systematic lower sound group velocity in the technologically important iodide-based compounds compared to the bromide-based ones. The findings suggest that low thermal conductivity and hot phonon bottleneck phenomena are expected to be enhanced by low elastic stiffness, particularly in the case of the ultrasoft α-FAPbI3.
@article{arxiv.1801.08701,
title = {Elastic softness of hybrid lead halide perovskites},
author = {A. C. Ferreira and A. Létoublon and S. Paofai and S. Raymond and C. Ecolivet and B. Rufflé and S. Cordier and C. Katan and M. I. Saidaminov and A. A. Zhumekenov and O. M. Bakr and J. Even and Ph. Bourges},
journal= {arXiv preprint arXiv:1801.08701},
year = {2018}
}