Quasi-static elastic domains in the quantum paraelectric phase of SrTiO$_3$
In spite of a long history many electronic and lattice properties of the quantum paraelectric SrTiO3 remain puzzling. Last year we have discovered a novel ingredient that sets its ground state. We found that the softening of the TO mode is accompanied by a large TA-softening at a tiny q-vector pointing to the existence of fluctuating domains as wide as 20 nm. Motivated by our resuslts it has been proposed that quantum paraelectrics are driven by a flexo-electric coupling that may lead to long-range-ordered modulated phase. Here we apply for one week of experimenet on THALES to determine the energy boundary of the TA softening and its evolution in the ferroelectric phase of SrTiO3 (through the substitution with O18). This result may reveal the presence of an hidden incommensurate transition in the quantum paraelectric phase of SrTiO3. These measurements needs the use of -/20¿/20¿/- collimations in order to reduce as much as possible the contribution from the close (0,0,2) Bragg peak.
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The recommended format for citing this dataset in a research publication is in the following format:
FAUQUE Benoit; Bourges; C. W. Rischau; STEFFENS Paul and SUBEDI Alaska. (2023). Quasi-static elastic domains in the quantum paraelectric phase of SrTiO$_3$. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-572
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