Large anisotropic thermal conductivity of the intrinsically two-dimensional metallic oxide PdCoO2

Abstract : The highly conductive layered metallic oxide PdCoO2 is a near-perfect analog to an alkali metal in two dimensions. It is distinguished from other two-dimensional (2D) electron systems where the Fermi surface does not reach the Brillouin zone boundary by a high planar electron density exceeding 1015cm-2. The simple single-band quasi-2D electronic structure results in strongly anisotropic transport properties and limits the effectiveness of electron-phonon scattering. Measurements on single crystals in the temperature range from 10 to 300 K show that the thermal conductivity is much more weakly anisotropic than the electrical resistivity, as a result of significant phonon heat transport. The in-plane thermoelectric power is linear in temperature at 300 K and displays a purity-dependent peak around 50 K. Given the extreme simplicity of the band structure, it is possible to identify this peak with phonon drag driven by normal electron-phonon scattering processes. © 2015 American Physical Society.
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Contributeur : Elisabeth van T Hof <>
Soumis le : lundi 15 juillet 2019 - 18:05:09
Dernière modification le : mardi 16 juillet 2019 - 01:28:03

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R. Daou, R. Frésard, S. Hébert, A. Maignan. Large anisotropic thermal conductivity of the intrinsically two-dimensional metallic oxide PdCoO2. Physical Review B - Condensed Matter and Materials Physics, 2015, 91 (4), pp.041113. ⟨10.1103/PhysRevB.91.041113⟩. ⟨hal-02184132⟩

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