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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.06228 |
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| _version_ | 1866929706695131136 |
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| author | Zhang, He Wei, Xudong Zhong, Wei Ma, Xiaoli Wu, Liyunxiao Zhou, Jie Kawaguchi, Saori Kadobayashi, Hirokazu Cheng, Zhenxiang Gao, Guoying Yu, Xiaohui Mao, Ho-kwang Yue, Binbin Hong, Fang |
| author_facet | Zhang, He Wei, Xudong Zhong, Wei Ma, Xiaoli Wu, Liyunxiao Zhou, Jie Kawaguchi, Saori Kadobayashi, Hirokazu Cheng, Zhenxiang Gao, Guoying Yu, Xiaohui Mao, Ho-kwang Yue, Binbin Hong, Fang |
| contents | $\rm{RuO_2}$ stands as a quintessential rutile-type compound under ambient conditions, with its structural exploration under pressure bearing significant implications for both phase transition investigations and Earth science. Nonetheless, the precise phase transition sequence remains a debate. In this study, we disclose the emergence of the $Pbca$ phase alongside the enduring metallic character of $\rm{RuO_2}$ under megabar pressure. Employing state-of-the-art synchrotron X-ray diffraction, our observations delineate a phase transition trajectory progressing through rutile, $\rm{CaCl_2}$, and ultimately $Pbca$ phases. Notably, the $Pbca$ phase manifests immediately just after the rutile-$\rm{CaCl_2}$ transition, confining a narrow pressure regime for the pure $\rm{CaCl_2}$-type phase. Within the pressure range of 15.5 to 35.0 GPa, a coexistence of the $\rm{CaCl_2}$-type and $Pbca$ phases is observed, transforming to a sole presence of the $Pbca$ phase beyond 35.0 GPa. Electrical transport measurements conducted on both single crystal and powder samples confirm the enduring metallic conductivity of $\rm{RuO_2}$, persisting up to at least $\sim$120 GPa, albeit exhibiting a diminished conductivity at ultrahigh pressures due to a reduction in electronic density of states at the Fermi level. This study furnishes compelling evidence for the presence of the $Pbca$ phase across a broad pressure range, diverging from the previously widely acknowledged $Pa\bar{3}$ phase, thereby offering crucial insights into phase transition phenomena in other metal dioxides and advancing our comprehension of electronic behaviors within 4d and 5d electron systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_06228 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of a $Pbca$ phase and robust metallicity in $\rm{RuO_2}$ under pressure Zhang, He Wei, Xudong Zhong, Wei Ma, Xiaoli Wu, Liyunxiao Zhou, Jie Kawaguchi, Saori Kadobayashi, Hirokazu Cheng, Zhenxiang Gao, Guoying Yu, Xiaohui Mao, Ho-kwang Yue, Binbin Hong, Fang Materials Science $\rm{RuO_2}$ stands as a quintessential rutile-type compound under ambient conditions, with its structural exploration under pressure bearing significant implications for both phase transition investigations and Earth science. Nonetheless, the precise phase transition sequence remains a debate. In this study, we disclose the emergence of the $Pbca$ phase alongside the enduring metallic character of $\rm{RuO_2}$ under megabar pressure. Employing state-of-the-art synchrotron X-ray diffraction, our observations delineate a phase transition trajectory progressing through rutile, $\rm{CaCl_2}$, and ultimately $Pbca$ phases. Notably, the $Pbca$ phase manifests immediately just after the rutile-$\rm{CaCl_2}$ transition, confining a narrow pressure regime for the pure $\rm{CaCl_2}$-type phase. Within the pressure range of 15.5 to 35.0 GPa, a coexistence of the $\rm{CaCl_2}$-type and $Pbca$ phases is observed, transforming to a sole presence of the $Pbca$ phase beyond 35.0 GPa. Electrical transport measurements conducted on both single crystal and powder samples confirm the enduring metallic conductivity of $\rm{RuO_2}$, persisting up to at least $\sim$120 GPa, albeit exhibiting a diminished conductivity at ultrahigh pressures due to a reduction in electronic density of states at the Fermi level. This study furnishes compelling evidence for the presence of the $Pbca$ phase across a broad pressure range, diverging from the previously widely acknowledged $Pa\bar{3}$ phase, thereby offering crucial insights into phase transition phenomena in other metal dioxides and advancing our comprehension of electronic behaviors within 4d and 5d electron systems. |
| title | Observation of a $Pbca$ phase and robust metallicity in $\rm{RuO_2}$ under pressure |
| topic | Materials Science |
| url | https://arxiv.org/abs/2502.06228 |