Phonon propagation in isotopic diamond superlattices

Weng, H. K.; Nagakubo, A.; Ogi, H. et al.

Physical Review B, 2021, 104(5), 054112-1-054112-7

Number of Access:579（2025-10-09 11:46 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84175

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Title
Phonon propagation in isotopic diamond superlattices
Creator
CreatorName
Weng, H. K.
NRID
1000070751113 1000070751113
ORCID
0000-0001-7494-5099 0000-0001-7494-5099
researchmap permalink
nagakubo nagakubo
Scopus Author ID
55329400300 55329400300
CreatorName
Nagakubo, A.
NRID
1000090252626 1000090252626
researchmap permalink
read0042771 read0042771
Scopus Author ID
35563683500 35563683500
CreatorName
Ogi, H.
CreatorName
Watanabe, H.
Description
Weng H.K., Nagakubo A., Ogi H., et al. "Phonon propagation in isotopic diamond superlattices", Physical Review B, 104(5), 054112, 2021. https://doi.org/10.1103/physrevb.104.054112.
Abstract
The out-of-plane thermal conductivity and elastic constant of epitaxial [100] C12/C13 superlattice diamonds with layer thicknesses of 1, 30, and 100 nm are evaluated by picosecond ultrasound spectroscopy. The measured elastic constants of the superlattices are equivalent to those of single-layer diamond thin films. This result confirms our success in synthesizing superlattice specimens with few defects at the interfaces. Therefore, the phonon transport behavior is governed by the mass difference, not the interfacial defects. The measured thermal conductivity of the superlattices is lower than that of a pure C12 isotope diamond thin film. We estimated the lattice thermal conductivity using the lattice dynamics calculation, attributing the lowered thermal conductivity to the decrease in the phonon group velocity in superlattices. We further consider the effect of mini-umklapp scattering in the superlattice, which explains the dependence of the thermal conductivity on the layer thickness. We reveal that the mini-umklapp scattering effect becomes significant only for an isotope diamond superlattice because of the high Debye temperature and large relative mass difference.
Publisher
American Physical Society
Source Title
Physical Review B
Volume (Issue)
104(5)
Page
054112-1-054112-7
Date of Issued
2021-08-16
Language
English
Handle URL
https://hdl.handle.net/11094/84175
PISSN
24699950
eISSN
24699969
NCID
AA11187113
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1103/physrevb.104.054112
Access Rights
open access
CopyRight
Copyright 2021 by the American Physical Society
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article