Stability and Superconductivity of Ternary Polyhydrides
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917101842726912 |
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| author | Semenok, Dmitrii V. Zhou, Di Chen, Wuhao Kvashnin, Alexander G. Sadakov, Andrey V. Helm, Toni Ferreira, Pedro N. Heil, Christoph Pudalov, Vladimir M. Troyan, Ivan A. Struzhkin, Viktor V. |
| author_facet | Semenok, Dmitrii V. Zhou, Di Chen, Wuhao Kvashnin, Alexander G. Sadakov, Andrey V. Helm, Toni Ferreira, Pedro N. Heil, Christoph Pudalov, Vladimir M. Troyan, Ivan A. Struzhkin, Viktor V. |
| contents | We review five years of experimental and theoretical attempts (2020-2025) to enhance the superconducting critical temperature ($\textit{T$_c$}$) of hydrogen-rich compounds by alloying binary superhydrides with additional elements. Despite predictions of higher $\textit{T$_c$}$ in ternary systems such as La-Y-H, La-Ce-H, and Ca-Mg-H, experiments consistently show that the maximum $\textit{T$_c$}$ in disordered ternary superhydrides does not exceed that of the best binary parent hydrides within experimental uncertainty. Instead, alloying primarily stabilizes high-symmetry polyhydride phases at lower pressures, enabling $\textit{T$_c$}$ = 200 K near 110-120 GPa, while also improving vortex pinning and upper critical fields. Magnetic dopants suppress $\textit{T$_c$}$, whereas nonmagnetic additives leave it nearly unchanged, reminiscent of Anderson's theorem. These findings indicate that alloying is unlikely to raise $\textit{T$_c$}$, but can reduce the pressures required to stabilize high-$\textit{T$_c$}$ phases. We propose that fully ordered ternary hydrides, synthesized via controlled hydrogenation of intermetallic precursors, offer a promising route toward this goal. One of the most promising compounds of this kind is the recently discovered LaSc$_2$H$_{24}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_22877 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Stability and Superconductivity of Ternary Polyhydrides Semenok, Dmitrii V. Zhou, Di Chen, Wuhao Kvashnin, Alexander G. Sadakov, Andrey V. Helm, Toni Ferreira, Pedro N. Heil, Christoph Pudalov, Vladimir M. Troyan, Ivan A. Struzhkin, Viktor V. Superconductivity We review five years of experimental and theoretical attempts (2020-2025) to enhance the superconducting critical temperature ($\textit{T$_c$}$) of hydrogen-rich compounds by alloying binary superhydrides with additional elements. Despite predictions of higher $\textit{T$_c$}$ in ternary systems such as La-Y-H, La-Ce-H, and Ca-Mg-H, experiments consistently show that the maximum $\textit{T$_c$}$ in disordered ternary superhydrides does not exceed that of the best binary parent hydrides within experimental uncertainty. Instead, alloying primarily stabilizes high-symmetry polyhydride phases at lower pressures, enabling $\textit{T$_c$}$ = 200 K near 110-120 GPa, while also improving vortex pinning and upper critical fields. Magnetic dopants suppress $\textit{T$_c$}$, whereas nonmagnetic additives leave it nearly unchanged, reminiscent of Anderson's theorem. These findings indicate that alloying is unlikely to raise $\textit{T$_c$}$, but can reduce the pressures required to stabilize high-$\textit{T$_c$}$ phases. We propose that fully ordered ternary hydrides, synthesized via controlled hydrogenation of intermetallic precursors, offer a promising route toward this goal. One of the most promising compounds of this kind is the recently discovered LaSc$_2$H$_{24}$. |
| title | Stability and Superconductivity of Ternary Polyhydrides |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.22877 |