Extreme Thermopower Anisotropy and Interchain Transport in the Quasi-One-Dimensional Metal Li0.9Mo6O17

Author(s)

Cohn, J. L. ^[1] ; Moshfeghyeganeh, S. ^[1] ; dos Santos, C. A. M. ^[2] ; Neumeier, J. J. ^[3]

Affiliation

^[1] Univ Miami, Dept Phys, Coral Gables, FL 33124 - USA

^[2] Univ Sao Paulo, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil

^[3] Montana State Univ, Dept Phys, Bozeman, MT 59717 - USA

• Document type: Journal article
• Source: Physical Review Letters; v. 112, n. 18 MAY 8 2014.
• Web of Science Citations: 11

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 <= 500 K. For T >= 400 K the interchain transport is determined by thermal excitation of charge carriers from a valence band similar to 0.14 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. (AU)

• FAPESP's process: 09/54001-2 - Acquisition of cryogen-free equipment for the characterization of magnetic properties by vibrating sample magnetometry
• Grantee: Carlos Alberto Moreira dos Santos
• Support Opportunities: Multi-user Equipment Program