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BaBiO3, Condensed Matter Physics, Glass-like systems, Perovskites, Thermal conductivity
Abstract:
The perovskite BaBiO3 crystallizes in a cubic structure and undergoes structural transitions toward lower symmetry phases upon cooling. The two low-temperature monoclinic phases are insulating, and the origin of this unexpected non-metallic character has been under debate. Both monoclinic phases exhibit tilting and breathing distortions, which are connected with their insulating nature and may have important effects on phononic heat conductivity. Here, we report the first thermal conductivity measurement, κ(T), in pristine polycrystalline BaBiO3 from 1.5 K to 310 K. At low and intermediate temperatures, we observe features reminiscent of a glass-like behavior, whereas at high-temperatures we find a downturn
