Bussmann-Holder, A.; Kremer, R.K.; Roleder, K.; Salje, E.K.H. SrTiO3: Thoroughly Investigated but Still Good for Surprises. Condens. Matter2024, 9, 3.
Bussmann-Holder, A.; Kremer, R.K.; Roleder, K.; Salje, E.K.H. SrTiO3: Thoroughly Investigated but Still Good for Surprises. Condens. Matter 2024, 9, 3.
Bussmann-Holder, A.; Kremer, R.K.; Roleder, K.; Salje, E.K.H. SrTiO3: Thoroughly Investigated but Still Good for Surprises. Condens. Matter2024, 9, 3.
Bussmann-Holder, A.; Kremer, R.K.; Roleder, K.; Salje, E.K.H. SrTiO3: Thoroughly Investigated but Still Good for Surprises. Condens. Matter 2024, 9, 3.
Abstract
For decades SrTiO3 is in the focus of research with seemingly never-ending new insights regarding its ground state properties, its application potentials, its surface and interface properties, the superconducting state, the twin boundaries and domain functionalities, etc. Here, we focus on the already well-investigated lattice dynamics of STO and show that four different temperature regimes can be identified which dominate the elastic properties, the thermal conductivity and the birefringence. These regimes are the low-temperature quantum fluctuation dominated one, followed by an intermediate regime, the region of the structural phase transition at ~105 K and its vicinity, and at high temperatures a regime characterized by precursor and saturation effects. They can all be elucidated by lattice dynamical aspects. The relevant temperature dependences of the soft modes are discussed and their relationship to lattice polarizability is emphasized.
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