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- W4294920684 abstract "Hybrid 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 remains 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 deviations from the Debye limit, a common feature of pure hybrid perovskites and their mixtures. Our thermophysical analysis demonstrates that the (otherwise ordered) structure around the organic moiety is characterized by a substantial lowering of the local symmetry relative to what can be inferred from crystallographic studies. The physical origin of the observed thermophysical anomalies is unequivocally linked to excitations of sub-terahertz optical phonons responsible for translational–librational distortions of the octahedral units." @default.
- W4294920684 created "2022-09-08" @default.
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- W4294920684 date "2022-09-07" @default.
- W4294920684 modified "2023-10-15" @default.
- W4294920684 title "Unraveling the Ordered Phase of the Quintessential Hybrid Perovskite MAPbI<sub>3</sub>─Thermophysics to the Rescue" @default.
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- W4294920684 doi "https://doi.org/10.1021/acs.jpclett.2c02208" @default.
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