Characterising the soft modes in NTE material Ca2Mn1-yTiyO4
Ruddlesden-Popper (RP) layered perovskites, play host to remarkable properties such as superconductivity, ferroelectricity and fast anion conductivity. These properties are invariably coincident with symmetry breaking distortions driven by soft phonon modes whose character is that of BO6 octahedral tilts or rotations. We have recently added negative thermal expansion (NTE) to the list of remarkable properties that these RP compounds display. In this case, the property of interest seems to be driven by the proximity of the system to a phase transition whose driving soft modes have negative Grüneisen parameters. While we have made substantial progress in controlling the negative thermal expansion driven by these soft modes in these compounds over wide temperature ranges, we haven't yet managed to observe a direct experimental signature for their existence. Here we propose to study the temperature dependent evolution of these soft modes on IN6 between 300 and 1200 K.The results will complement our current theoretical studies in this area and will feed into a broader understanding of how soft mode phase transitions can be controlled in order to enhance functional properties.
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Mark S Senn; BEQIRI Dashnor; BERROD Quentin and ZANOTTI Jean-Marc. (2021). Characterising the soft modes in NTE material Ca2Mn1-yTiyO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-205
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