Competition between Polar and Antiferrodistortive Modes and Correlated Dynamics of the Methylammonium Molecules in MAPbI${}_3$ from Anelastic and Dielectric Measurements

Francesco Cordero, Floriana Craciun, Francesco Trequattrini +3

The mechanisms behind the exceptional photovoltaic properties of the metallorganic perovskites are still debated, and include a ferroelectric (FE) state from the ordering of the el…