Extreme thermopower anisotropy and interchain transport in the quasi-one-dimensional metal Li0.9Mo6 O17

J. L. Cohn, S. Moshfeghyeganeh, C. A.M. Dos Santos, J. J. Neumeier

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11 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number186602
JournalPhysical Review Letters
Volume112
Issue number18
DOIs
StatePublished - May 8 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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