Abstract
We quantify the low lattice thermal conductivity in layered BiCuSeO (the oxide with the highest known figure of merit). It turns out that the scattering of acoustical into optical phonons is strongly enhanced in the material because of the special structure of the phonon dispersion. For example, at room temperature the optical phonons account for an enormous 42% of the lattice thermal conductivity. We also quantify the anisotropy of the lattice thermal conductivity and determine the distribution of the mean free path of the phonons at different temperatures to provide a guide for tuning the thermal properties.
| Original language | English |
|---|---|
| Pages (from-to) | 19158-19164 |
| Number of pages | 7 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 18 |
| Issue number | 28 |
| DOIs | |
| State | Published - 2016 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© the Owner Societies 2016.
Funding
The research reported in this publication was supported by funding from the King Abdullah University of Science and Technology (KAUST).
| Funders | Funder number |
|---|---|
| King Abdullah University of Science and Technology |