Extreme Thermopower Anisotropy and Interchain Transport in the Quasi-One-Dimensional Metal Li0.9Mo6O17
Year: 2014
Type: article
Abstract: Thermopower and electrical resistivity measurements transverse to the conducting chains of the quasi-one-dimensional metal ${\mathrm{Li}}_{0.9}{\mathrm{Mo}}_{6}{\mathrm{O}}_{17}$ are reported in the temperature range $5\ensuremath{\le}T\ensuremath{\le}500\text{ }\text{ }\mathrm{K}$. For $T\ensuremath{\ge}400\text{ }\text{ }\mathrm{K}$ the interchain transport is determined by thermal excitation of charge carriers from a valence band $\ensuremath{\sim}0.14\text{ }\text{ }\mathrm{eV}$ below the Fermi level, giving rise to a large, $p$-type thermopower that coincides with a small, $n$-type thermopower along the chains. This dichotomy---semiconductorlike in one direction and metallic in a mutually perpendicular direction---gives rise to substantial transverse thermoelectric effects and a transverse thermoelectric figure of merit among the largest known for a single compound.
Source: Physical Review Letters
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2002786076