X-ray Diffraction and Electrical Transport Imaging of Superconducting Superhydride (La,Y)H10
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908733301325824 |
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| author | Marathamkottil, Abdul Haseeb Manayil Wang, Kui Salke, Nilesh P. Ahart, Muhtar Mark, Alexander C. Hrubiak, Ross Chariton, Stella Smith, Dean Prakapenka, Vitali B. Somayazulu, Maddury Velisavljevic, Nenad Hemley, Russell J. |
| author_facet | Marathamkottil, Abdul Haseeb Manayil Wang, Kui Salke, Nilesh P. Ahart, Muhtar Mark, Alexander C. Hrubiak, Ross Chariton, Stella Smith, Dean Prakapenka, Vitali B. Somayazulu, Maddury Velisavljevic, Nenad Hemley, Russell J. |
| contents | We report the synthesis and characterization of (La0.9Y0.1)H10 superhydrides exhibiting coexisting cubic Fm-3m and hexagonal P63/mmc clathrate phases observed over the pressure range from 168 GPa down to 136 GPa. Using synchrotron-based X-ray diffraction imaging (XDI) at the upgraded Advanced Photon Source (APS-U), we spatially resolved micron-scale distributions of these phases, revealing structural inhomogeneity across the sample. Four-probe DC resistance measurements confirmed superconductivity, with two distinct transitions: an onset at 244 K associated with the cubic phase and a second near 220 K linked to the hexagonal phase. Notably, resistance profiles collected from different current and voltage permutations showed variations in transition width and onset temperature that correlated with the spatial phase distribution mapped by XDI. These findings demonstrate a direct connection between local structural domains and superconducting behavior. Yttrium substitution is found to influence both the phase behavior and superconducting properties of LaH10-type clathrate hydrides. More broadly, this study highlights the utility of spatially correlating structural and electrical transport measurements in materials exhibiting heterogeneity under pressure, including hydride superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_18831 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | X-ray Diffraction and Electrical Transport Imaging of Superconducting Superhydride (La,Y)H10 Marathamkottil, Abdul Haseeb Manayil Wang, Kui Salke, Nilesh P. Ahart, Muhtar Mark, Alexander C. Hrubiak, Ross Chariton, Stella Smith, Dean Prakapenka, Vitali B. Somayazulu, Maddury Velisavljevic, Nenad Hemley, Russell J. Superconductivity We report the synthesis and characterization of (La0.9Y0.1)H10 superhydrides exhibiting coexisting cubic Fm-3m and hexagonal P63/mmc clathrate phases observed over the pressure range from 168 GPa down to 136 GPa. Using synchrotron-based X-ray diffraction imaging (XDI) at the upgraded Advanced Photon Source (APS-U), we spatially resolved micron-scale distributions of these phases, revealing structural inhomogeneity across the sample. Four-probe DC resistance measurements confirmed superconductivity, with two distinct transitions: an onset at 244 K associated with the cubic phase and a second near 220 K linked to the hexagonal phase. Notably, resistance profiles collected from different current and voltage permutations showed variations in transition width and onset temperature that correlated with the spatial phase distribution mapped by XDI. These findings demonstrate a direct connection between local structural domains and superconducting behavior. Yttrium substitution is found to influence both the phase behavior and superconducting properties of LaH10-type clathrate hydrides. More broadly, this study highlights the utility of spatially correlating structural and electrical transport measurements in materials exhibiting heterogeneity under pressure, including hydride superconductors. |
| title | X-ray Diffraction and Electrical Transport Imaging of Superconducting Superhydride (La,Y)H10 |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2507.18831 |