Abstract:Hybrid organic-inorganic perovskites continue to attract an enormous amount of attention, yet a robust microscopic picture of their different phases as well as the extent and nature of the disorder present remain elusive. Using specific-heat data along with high-resolution inelastic neutron scattering and ab initio modeling, we address this ongoing challenge for the case of the ordered phase of the quintessential hybrid perovskite MAPbI3. At low-temperatures, the specific heat of MAPbI3 reveals strong deviatio… Show more
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