Unraveling the unusually high electrical conductivity of the delafossite metal PdCoO$_2$
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913612251004928 |
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| author | Yao, Xiaoping Xun, Yechen Zhu, Ziye Zhao, Shu Li, Wenbin |
| author_facet | Yao, Xiaoping Xun, Yechen Zhu, Ziye Zhao, Shu Li, Wenbin |
| contents | The prototypical delafossite metal PdCoO$_2$ has been the subject of intense interest for hosting exotic transport properties. Using first-principles transport calculations and theoretical modeling, we reveal that the high electrical conductivity of PdCoO$_2$ at room temperature originates from the contributions of both high Fermi velocities, enabled by Pd $4d_{z^2}-5s$ hybridization, and exceptionally weak electron-phonon coupling, which leads to a coupling strength ($λ=0.057$) that is nearly an order of magnitude smaller than those of common metals. The abnormally weak electron-phonon coupling in PdCoO$_2$ results from a low electronic density of states at the Fermi level, as well as the large and strongly facetted Fermi surface with suppressed Umklapp electron-phonon matrix elements. We anticipate that our work will inform the design of unconventional metals with superior transport properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_04327 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Unraveling the unusually high electrical conductivity of the delafossite metal PdCoO$_2$ Yao, Xiaoping Xun, Yechen Zhu, Ziye Zhao, Shu Li, Wenbin Materials Science The prototypical delafossite metal PdCoO$_2$ has been the subject of intense interest for hosting exotic transport properties. Using first-principles transport calculations and theoretical modeling, we reveal that the high electrical conductivity of PdCoO$_2$ at room temperature originates from the contributions of both high Fermi velocities, enabled by Pd $4d_{z^2}-5s$ hybridization, and exceptionally weak electron-phonon coupling, which leads to a coupling strength ($λ=0.057$) that is nearly an order of magnitude smaller than those of common metals. The abnormally weak electron-phonon coupling in PdCoO$_2$ results from a low electronic density of states at the Fermi level, as well as the large and strongly facetted Fermi surface with suppressed Umklapp electron-phonon matrix elements. We anticipate that our work will inform the design of unconventional metals with superior transport properties. |
| title | Unraveling the unusually high electrical conductivity of the delafossite metal PdCoO$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2308.04327 |