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| Hauptverfasser: | , , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| Online-Zugang: | https://arxiv.org/abs/2411.11146 |
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| _version_ | 1866918022889865216 |
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| author | Uykur, Ece Janson, Oleg Ginga, Victoria A. Schmidt, Marcus Giordano, Nico Tsirlin, Alexander A. |
| author_facet | Uykur, Ece Janson, Oleg Ginga, Victoria A. Schmidt, Marcus Giordano, Nico Tsirlin, Alexander A. |
| contents | Pressure evolution of RuO2 is studied using single-crystal x-ray diffraction in a diamond anvil cell, combined with \textit{ab initio} band-structure calculations. The tetragonal rutile structure transforms into the orthorhombic CaCl$_2$-type structure above 13 GPa under quasi-hydrostatic pressure conditions. This second-order transition is ferroelastic in nature and accompanied by tilts of the RuO$_6$ octahedra. Orthorhombic RuO$_2$ is expected to be paramagnetic metal, similar to ambient-pressure RuO$_2$. It shows the increased $t_{2g}-e_g$ crystal-field splitting that is responsible for the pressure-induced color change. It further features the Dirac nodal line that shifts across the Fermi level upon compression. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_11146 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tunable Dirac nodal line in orthorhombic RuO$_2$ Uykur, Ece Janson, Oleg Ginga, Victoria A. Schmidt, Marcus Giordano, Nico Tsirlin, Alexander A. Materials Science Pressure evolution of RuO2 is studied using single-crystal x-ray diffraction in a diamond anvil cell, combined with \textit{ab initio} band-structure calculations. The tetragonal rutile structure transforms into the orthorhombic CaCl$_2$-type structure above 13 GPa under quasi-hydrostatic pressure conditions. This second-order transition is ferroelastic in nature and accompanied by tilts of the RuO$_6$ octahedra. Orthorhombic RuO$_2$ is expected to be paramagnetic metal, similar to ambient-pressure RuO$_2$. It shows the increased $t_{2g}-e_g$ crystal-field splitting that is responsible for the pressure-induced color change. It further features the Dirac nodal line that shifts across the Fermi level upon compression. |
| title | Tunable Dirac nodal line in orthorhombic RuO$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2411.11146 |