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Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: CE: Heavy Fermions

TT 26.13: Vortrag

Mittwoch, 24. März 2010, 17:30–17:45, H21

Enhanced thermoelectricity and strong correlations in FeSb2 — •Niels Oeschler1, Peijie Sun1, Simon Johnsen2, Bo B. Iversen2, and Frank Steglich11Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Department of Chemistry, University of Aarhus, Aarhus, Denmark

FeSb2 was recently identified as a narrow-gap semiconductor with indications of strong electron-electron correlations. Around 10 K the thermopower S assumes huge absolute values of more than 40 mV/K. It has been shown that the thermopower of FeSb2 is of diffusive nature and strongly enhanced due to the appearance of strong correlations.
By substituting Te on the Sb site, an atom with one extra electron relative to Sb, an evolution from a semiconducting ground state into a metallic one is observed for small Te content. The thermopower of FeSb1.98Te0.02 is linear in T as expected for metals, however, with enhanced slope compared to the free-electron predictions. Deduced from specific heat and Hall effect measurements the effective charge-carrier mass m is determined to be as large as 15 times the free electron mass, consistent with the enhanced thermopower.

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