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Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.83: Poster

Thursday, March 19, 2015, 09:30–12:00, Poster A

Tuning the thermoelectric properties of cobaltates by epitaxial strain — •Markus Ernst Gruner1,2 and Rossitza Pentcheva2,11Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, Lichtenbergstraße 1, 85748 Garching, Germany — 2Faculty of Physics and Center for Nanointegration, CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany

The hexagonal delafossites PdCoO2 and PtCoO2 exhibit highly anisotropic transport properties and have been identified as potential themoelectric materials. For instance, along the hexagonal a-b-plane the thermopower Sxx exhibits positive values characterisitic of a regular metal, while negative values Szz are encountered in direction of the c-axis, with a much higher absolute value [1]. By means of density functional theory calculations in connection with Boltzmann transport theory we investigate the effect of epitaxial strain on the thermoelectric properties. We find that for PdCoO2 the anisotropic properties of conductivity and thermopower are essentially maintained under in-plane strain. Moreover, a 30% variation of Szz is found in the considered strain regime. The transport results are related to the specific properties of electronic structure and Fermi surface. Funding by the DFG (SFB/TR80, project G8) is gratefully acknowledged.
  [1] K. P. Ong, D. J. Singh, P. Wu, Phys. Rev. Lett. 104, 176601 (2014).

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