Anharmonicity and soft modes in SrTiO3
SrTiO3 is a quantum para-elelctric material which hosts an anti-ferrodistortive (AFD) structural phase transition 105K. In spite of a long history many electronic and lattice properties remain puzzling to date in this system. Since early works it is known that the softening of the zone centered optical (TO) mode is accompanied by an intensity loss of the acoustic (TA) mode. It is only this year that it has been captured by first principle calculations. Previous measurements at LLB have shown that both soft modes (associated with the ferroelectric and the AFD transitions, respectively) have the same temperature dependence and that the intensity loss of the TA mode is dramatically accelerated below the AFD transition. Both results are surprising. Here we propose to explore the fate of the M-point soft mode and to track carefully the fate of the TA branch at different Q vectors. Through a comparison with the most advanced first principle calculation these results will clarify the nature of the interplay between the different soft modes and will provide valuable inputs for the ongoing discussion about the puzzling electrical, superconducting and thermal properties of SrTiO3.
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FAUQUE Benoit; Bourges; STEFFENS Paul and SUBEDI Alaska. (2021). Anharmonicity and soft modes in SrTiO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-206
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