Unknown

Dataset Information

0

Intrinsic anharmonic localization in thermoelectric PbSe.


ABSTRACT: Lead chalcogenides have exceptional thermoelectric properties and intriguing anharmonic lattice dynamics underlying their low thermal conductivities. An ideal material for thermoelectric efficiency is the phonon glass-electron crystal, which drives research on strategies to scatter or localize phonons while minimally disrupting electronic-transport. Anharmonicity can potentially do both, even in perfect crystals, and simulations suggest that PbSe is anharmonic enough to support intrinsic localized modes that halt transport. Here, we experimentally observe high-temperature localization in PbSe using neutron scattering but find that localization is not limited to isolated modes - zero group velocity develops for a significant section of the transverse optic phonon on heating above a transition in the anharmonic dynamics. Arrest of the optic phonon propagation coincides with unusual sharpening of the longitudinal acoustic mode due to a loss of phase space for scattering. Our study shows how nonlinear physics beyond conventional anharmonic perturbations can fundamentally alter vibrational transport properties.

SUBMITTER: Manley ME 

PROVIDER: S-EPMC6486597 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

altmetric image

Publications


Lead chalcogenides have exceptional thermoelectric properties and intriguing anharmonic lattice dynamics underlying their low thermal conductivities. An ideal material for thermoelectric efficiency is the phonon glass-electron crystal, which drives research on strategies to scatter or localize phonons while minimally disrupting electronic-transport. Anharmonicity can potentially do both, even in perfect crystals, and simulations suggest that PbSe is anharmonic enough to support intrinsic localiz  ...[more]

Similar Datasets

| S-EPMC5700627 | biostudies-literature
| S-EPMC9616947 | biostudies-literature
| S-EPMC3382475 | biostudies-literature
| S-EPMC6057949 | biostudies-literature
| S-EPMC7080995 | biostudies-literature
| S-EPMC10051061 | biostudies-literature
| S-EPMC4327545 | biostudies-literature
| S-EPMC3098556 | biostudies-literature
| S-EPMC4217114 | biostudies-literature
| S-EPMC10320779 | biostudies-literature