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Issue 32, 2017
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The role of phonon–phonon and electron–phonon scattering in thermal transport in PdCoO2

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Abstract

The layered metal oxide PdCoO2 is of fundamental interest in solid-state physics due to its unique nature as a two-dimensional electron gas. It is well known that electron–phonon scattering plays the leading role in the electrical transport of lots of materials; however, the influence of electron–phonon coupling on the thermal transport in PdCoO2 is rarely studied. Herewith we employ ab initio calculations to study the phonon lifetimes of PdCoO2 due to electron–phonon scattering and anharmonic phonon–phonon interactions. It is found that electron–phonon scattering has a large correction to the lattice thermal conductivity of PdCoO2 for both the in-plane and cross-plane directions, which is reduced by 21% and 27%, respectively. Moreover, the correction becomes larger and is more significant for the in-plane direction with decreasing temperature. As a result, the cross-plane lattice thermal transport overwhelms the in-plane value at low temperatures. This study provides useful guidance for the development of relevant devices involving two-dimensional electron gas systems.

Graphical abstract: The role of phonon–phonon and electron–phonon scattering in thermal transport in PdCoO2

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Publication details

The article was received on 31 May 2017, accepted on 18 Jul 2017 and first published on 18 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP03667A
Citation: Phys. Chem. Chem. Phys., 2017,19, 21714-21721
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    The role of phonon–phonon and electron–phonon scattering in thermal transport in PdCoO2

    L. Cheng, Q. Yan and M. Hu, Phys. Chem. Chem. Phys., 2017, 19, 21714
    DOI: 10.1039/C7CP03667A

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