Year: 2020
Type: article
Abstract: We have examined size effect on thermal, transport, and thermodynamic properties of a ${\mathrm{CrSb}}_{2}$ single crystal. We demonstrate highly anisotropic quasi-one-dimensional electrical conductivity, quasiballistic phonons, and giant thermopower of $\ensuremath{-}6$ mV/K at 15 K. A thermopower peak is suppressed to $\ensuremath{-}1.6$ mV/K by changing crystal dimensions and shows linear dependence on the phonon mean-free path. Whereas electronic diffusion thermopower is significant, the bulk of the giant thermopower in ${\mathrm{CrSb}}_{2}$ stems from the coupling of the very long mean-free path phonons with the in-gap states.
Authors: Qianheng Du, David Guzman, Sangkook Choi, C. Petrovic
Institutions: Brookhaven National Laboratory, Stony Brook University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Award: G42916606
OpenAlex ID: W2999613794