|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Thermal Property Characterization, Modeling, and Theory in Extreme Environments
||Thermal behaviors of correlated insulators ThO2 and SmB6
||Narayan Poudel, Daniel Murray, Matthew Mann, Jason Jeffries, Krzysztof Gofryk
|On-Site Speaker (Planned)
Thermal transport properties of single crystals are essential in design and development of modern nuclear reactors. These properties also play important role in probing the new quantum materials. In this work, we present our detailed study of thermal transport in thorium dioxide (ThO2) and samarium hexaboride (SmB6) single crystals. Both materials crystalize in the cubic crystal structure and their properties are governed by strong electronic correlations. ThO2 is a wide-gap transparent insulator (Eg~5-6 eV) whereas SmB6 is a narrow-gap topological Kondo insulator (Eg<15 meV). By performing extensive thermal studies at low temperatures, where different scattering mechanisms such as boundary, defects, and/or phonon-phonon dominate heat transport, we are able to study details of phonon-phonon interactions in ThO2 and the effects of boundary scattering in micro-size SmB6 single crystal.