Stability and Superconductivity of Ternary Polyhydrides

ABSTRACT We review five years of experimental and theoretical attempts (2020–2025) to enhance the superconducting critical temperature ( T c ) of hydrogen‐rich compounds by alloying binary superhydrides with additional elements. Despite predictions of higher T c in ternary systems such as La–Y–H, La–Ce–H, and Ca–Mg–H, experiments consistently show that the maximum 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 T c ≈ 200 K near 100–110 GPa, while also strengthening vortex pinning and upper critical fields. Magnetic dopants suppress T c , whereas nonmagnetic additives leave it nearly unchanged, reminiscent of Anderson's theorem. These findings indicate that alloying is unlikely to raise T c , but can reduce the pressures required to stabilize high‐ 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 .

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Publication Details

Journal
Annalen der Physik
Published
2025-11-21
DOI
https://doi.org/10.1002/andp.202500467
Citations
2
Primary Topic
Hydrogen Storage and Materials
Type
article
Field-Weighted Citation Impact
1.04

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article

Stability and Superconductivity of Ternary Polyhydrides

A. V. Sadakov, Viktor V. Struzhkin, I. A. Troyan, Alexander G. Kvashnin et al.
2 citations
Annalen der Physik
Hydrogen Storage and Materials
1.04
article

Stability and Superconductivity of Ternary Polyhydrides

A. V. Sadakov, Viktor V. Struzhkin, I. A. Troyan, Alexander G. Kvashnin, Christoph Heil, Wuhao Chen, V. M. Pudalov, Pedro P. Ferreira, Dmitrii V. Semenok, Di Zhou, Toni Helm
article en
2 citations

Abstract

ABSTRACT We review five years of experimental and theoretical attempts (2020–2025) to enhance the superconducting critical temperature ( T c ) of hydrogen‐rich compounds by alloying binary superhydrides with additional elements. Despite predictions of higher T c in ternary systems such as La–Y–H, La–Ce–H, and Ca–Mg–H, experiments consistently show that the maximum 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 T c ≈ 200 K near 100–110 GPa, while also strengthening vortex pinning and upper critical fields. Magnetic dopants suppress T c , whereas nonmagnetic additives leave it nearly unchanged, reminiscent of Anderson's theorem. These findings indicate that alloying is unlikely to raise T c , but can reduce the pressures required to stabilize high‐ 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 .

Annalen der PhysikVol. 538(1)
National Research University Higher School of Economics (RU), Skolkovo Institute of Science and Technology (RU), Helmholtz-Zentrum Dresden-Rossendorf (DE), Graz University of Technology (AT), Shenzhen Bay Laboratory (CN), Nawi Graz (AT), Shanghai Advanced Research Institute (CN), A.V. Shubnikov Institute of Crystallography (RU), Center for High Pressure Science and Technology Advanced Research (CN), Institute of High Temperature Electrochemistry (RU), Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (CN)
European Commission, National Natural Science Foundation of China, China Postdoctoral Science Foundation, Science and Technology Commission of Shanghai Municipality, Russian Science Foundation, Helmholtz-Zentrum Dresden-Rossendorf, National Key Research and Development Program of China
Openalex Percentile: Top 21%
Hydrogen Storage and Materials
1.04
DOIOpen Access PDFOpenAlex
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