The ferroelectric-paraelectric transition in the hybrid improper ferroelectric material Ca3Ti2O7
It is rather rare to find a new ferroelectric (FE) material, let alone predicted theoretically in the first place and then later confirmed by experiments. However, it was recently shown that (Ca,Sr)3Ti2O7 bulk single crystals become hybrid improper ferroelectrics just as theoretically predicted [1]. It is remarkable how two types of octahedron rotation can be coupled trilinearly to produce the FE state at room temperature. Despite the experimental report [3], it is still largely unknown how the FE state transforms into a paraelectric (PE) phase at high temperatures. In this proposal, we suggest to investigate the FE-PE transition at high temperatures and provide the detailed description of the theoretically proposed trilinear coupling of the two octahedron rotations.
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PARK Je-Geun; D.T. Adroja; CHEONG S-W.; FERNANDEZ DIAZ Maria Teresa; KLICPERA Milan; KRATOCHVILOVA marie and SECHOVSKY Vladimir. (2016). The ferroelectric-paraelectric transition in the hybrid improper ferroelectric material Ca3Ti2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-15-610
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