Unraveling Structural Triggers for the Anomalous Thermal Transport Behavior of Eu1¿xCaxTiO3¿d on the Long- and Short-range
Anomalous thermal transport behavior below RT has been observed for several members of the solid solution Eu1-xCaxTiO3-d, e.g., glass-like thermal conductivity if x <0.3 (cubic phases) and 2 maxima of thermal conductivity for x>0.3 (orthorhombic phases). This implies that the crystal structure and in particular the local structure arrangements play a crucial role for the understanding of these phenomena. Additionally, all samples show a second order phase transition at ca. 290 K, while the origin is only understood for pristine EuTiO3 (tetragonal-cubic phase transition). For all other samples neutron diffraction and neutron PDF analysis are required to identify the role of the oxygen ions on this transition and thermal conductivity. The collected data will be combined with already measured complementary X-ray-based data providing information about the cations. The thermal transport data potentially imply a transition from a soft lattice (EuTiO3-like) via an intermediate state where soft and rigid sublattice are competing with each other to a rigid (CaTiO3-like) sublattice. The proposed experiments will enable to support (or disprove) this statement from a stuctural perspective.
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WIDENMEYER Marc; BIANCONI Federico; CUELLO Gabriel; EMMERICH Ann-Katrin; Thomas C. Hansen; RASHID Aasir; SCAVINI Marco; TRAPLETTI Andrea; XIAO Xingxing and XIE Wenjie. (2023). Unraveling Structural Triggers for the Anomalous Thermal Transport Behavior of Eu1¿xCaxTiO3¿d on the Long- and Short-range. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-715
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