2022/08/01 by Narayan Poudel, Daniel J. Murray, Poudel, Narayan +5
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Diamond and Carbon-based Materials Research #FOS: Physical sciences #High-pressure geophysics and materials #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.2208.01145
openalex publication_date 2022/08/01 · openalex created_date 2023/02/14 · openalex updated_date 2026/07/28
We have studied the effects of phonon-boundary scattering on the thermal transport in topological Kondo insulator, SmB6. The studies have been performed by using the 3ω method in the temperature range 300K - 3K. We show that the observed thermal conductivity of micro-size SmB6 is of the order of magnitude smaller than for a bulk single-crystal. Using the Callaway model we analyzed the low-temperature lattice thermal conductivity of the micro crystal and show that phonon scattering by sample boundaries plays a major role in the thermal resistance in this topological material. In addition, we show that the temperature dependence of the lattice thermal conductivity shows a double peak structure that suggests complex phonon-phonon or phonon-defects interactions in SmB6. These findings provide guidance for the understanding of the thermal transport of advanced materials and devices at a micro-scale.