Insulating transport in anisotropic metals: breakdown of Drude transport and the puzzling $c$-axis resistivity of Sr$_2$RuO$_4$ and other layered oxides
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866915533566246912 |
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| author | Beck, Sophie Shammami, Matthew Van Muñoz, Lorenzo Kaye, Jason Georges, Antoine Mravlje, Jernej |
| author_facet | Beck, Sophie Shammami, Matthew Van Muñoz, Lorenzo Kaye, Jason Georges, Antoine Mravlje, Jernej |
| contents | We reveal a mechanism that may explain the non-metallic out-of-plane resistivity in layered metals. By carefully examining how the Drude-Boltzmann expression for the $c$-axis conductivity emerges out of the Kubo formula, we find, besides the standard metallic term proportional to the carrier lifetime $τ$, a non-Drude contribution proportional to $1/τ$. The Drude behavior breaks down when $1/τ> 2 η^*$, the crossover value $η^*$ being small (and hence observable) when the $c$-axis velocities vary rapidly with the distance from the Fermi surface. We consider the Hund metal Sr$_2$RuO$_4$ as a test case, which we study within a realistic dynamical mean-field theory approach. The non-Drude behavior observed experimentally in $c$-axis transport is reproduced and explained by our considerations, showing that earlier invoked extrinsic mechanisms that involve either impurities or phonons are unnecessary. We point out that the small value of $η^*$ is due to a peculiar accidental cancellation due to destructive interference characteristic of body-centered tetragonal lattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_03756 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Insulating transport in anisotropic metals: breakdown of Drude transport and the puzzling $c$-axis resistivity of Sr$_2$RuO$_4$ and other layered oxides Beck, Sophie Shammami, Matthew Van Muñoz, Lorenzo Kaye, Jason Georges, Antoine Mravlje, Jernej Strongly Correlated Electrons Materials Science We reveal a mechanism that may explain the non-metallic out-of-plane resistivity in layered metals. By carefully examining how the Drude-Boltzmann expression for the $c$-axis conductivity emerges out of the Kubo formula, we find, besides the standard metallic term proportional to the carrier lifetime $τ$, a non-Drude contribution proportional to $1/τ$. The Drude behavior breaks down when $1/τ> 2 η^*$, the crossover value $η^*$ being small (and hence observable) when the $c$-axis velocities vary rapidly with the distance from the Fermi surface. We consider the Hund metal Sr$_2$RuO$_4$ as a test case, which we study within a realistic dynamical mean-field theory approach. The non-Drude behavior observed experimentally in $c$-axis transport is reproduced and explained by our considerations, showing that earlier invoked extrinsic mechanisms that involve either impurities or phonons are unnecessary. We point out that the small value of $η^*$ is due to a peculiar accidental cancellation due to destructive interference characteristic of body-centered tetragonal lattices. |
| title | Insulating transport in anisotropic metals: breakdown of Drude transport and the puzzling $c$-axis resistivity of Sr$_2$RuO$_4$ and other layered oxides |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2510.03756 |