Ontology highlight
ABSTRACT:
SUBMITTER: Mukhopadhyay S
PROVIDER: S-EPMC5111060 | biostudies-literature | 2016 Nov
REPOSITORIES: biostudies-literature
Mukhopadhyay Saikat S Lindsay Lucas L Singh David J DJ
Scientific reports 20161116
The lattice thermal conductivity (κ) of hexagonal Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (h-GST) is studied via direct first-principles calculations. We find significant intrinsic anisotropy (κ<sub>a</sub>/κ<sub>c</sub>~2) of κ in bulk h-GST, with the dominant contribution to κ from optic phonons, ~75%. This is extremely unusual as the acoustic phonon modes are the majority heat carriers in typical semiconductors and insulators. The anisotropy derives from varying bonding along different cry ...[more]