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Phys Rev Lett. 2012 Feb 3;108(5):056604. Epub 2012 Feb 2.

Giant Nernst effect and bipolarity in the quasi-one-dimensional metal Li0.9Mo6O17.

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1
Department of Physics, University of Miami, Coral Gables, Florida 33124, USA.

Abstract

The Nernst coefficient for the quasi-one-dimensional metal, Li{0.9}Mo{6}O{17}, is found to be among the largest known for metals (ν≃500  μV/KT at T∼20  K), and is enhanced in a broad range of temperature by orders of magnitude over the value expected from Boltzmann theory for carrier diffusion. A comparatively small Seebeck coefficient implies that Li{0.9}Mo{6}O{17} is bipolar with large, partial Seebeck coefficients of opposite sign. A very large thermomagnetic figure of merit, ZT∼0.5, is found at high field in the range T≈35-50  K.

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