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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 - typical of a crystalline solid. We compare our findings with available data of other recently investigated perovskite oxides displaying similar temperature dependence.
목차
I. INTRODUCTION
II. METHODS
III. RESULTS AND DISCUSSION
IV. CONCLUSIONS
REFERENCES
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