2021/12/14 by Hsu Kai Weng, Akira Nagakubo, Hideyuki Watanabe +1 · 1 citation
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Composite material #Condensed matter physics #Diamond #Diamond and Carbon-based Materials Research #Diamond cubic #High-pressure geophysics and materials #Lattice (music) #Materials science #Nuclear Materials and Properties #Physics #Superlattice #Thermal conductivity #physics.app-ph
paper · pdf · doi:10.35848/1347-4065/ac4304
published in Japanese Journal of Applied Physics 61(SG), SG1004 (Institute of Physics)
arxiv created 2021/12/14 · openalex publication_date 2021/12/14 · arxiv updated 2022/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study lattice thermal conductivity of isotope diamond superlattices consisting of 12C and 13C diamond layers at various superlattice periods. It is found that the thermal conductivity of a superlattice is significantly deduced from that of pure diamond because of the reduction of the phonon group velocity near the folded Brillouin zone. The results show that asymmetric superlattices with different number of layers of 12C and 13C diamonds exhibit higher thermal conductivity than symmetric superlattices even with the same superlattice period, and we find that this can be explained by the trade-off between the effects of phonon specific heat and phonon group velocity. Furthermore, impurities and imperfect superlattice structures are also found to significantly reduce the thermal conductivity, suggesting that these effects can be exploited to control the thermal conductivity over a wide range.