Large anisotropic thermal conductivity of the intrinsically two-dimensional metallic oxide PdCoO2 - Normandie Université Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2015

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.

Dates and versions

hal-02184132 , version 1 (15-07-2019)

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Cite

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 (1998-2015), 2015, 91 (4), pp.041113. ⟨10.1103/PhysRevB.91.041113⟩. ⟨hal-02184132⟩
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