Thermopower and electrical resistivity measurements transverse to the conducting chains of the quasi-one-dimensional metal Li0.9Mo6O17 are reported in the temperature range 5≤T≤500K. For T≥400K the interchain transport is determined by thermal excitation of charge carriers from a valence band ∼0.14eV 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)