Soft phonon mode in quantum paraelastic BaZrO3
The aim of the project is to demonstrate and characterize the phenomenon of "quantum paraelasticity" in the cubic perovskite BaZrO3. For that purpose, we propose to measure its "soft" phonon mode, the associated branch, and its evolution with temperature, with the aim to elucidate the role of quantum fluctuations in the phonon frequencies. A test experiment was carried out on IN22 and has enabled us to identify the mode of interest, and partly characterize its dispersion and its temperature-dependence. Here, we propose a follow-up experiment to complete the dispersion of the tilt mode(s) and the acoustic modes along the directions of interest at room and low temperatures.
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GUENNOU Mael; HAUMONT Raphael; MAGLIONE Mario and PIOVANO Andrea. (2021). Soft phonon mode in quantum paraelastic BaZrO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-190
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