Superconductivity at 253 K in lanthanum–yttrium ternary hydrides

Semenok, Dmitrii V.; Troyan, I. A.; Иванова, А. Г.; Kvashnin, Alexander G.; Kruglov, Ivan A.; Hanfland, Michael; Sadakov, A. V.; Sobolevskiy, O. A.; Pervakov, K. S.; Lyubutin, I. S.; Glazyrin, Konstantin; Giordano, Nico; Каримов, Д. Н.; Vasiliev, Alexander L.; Akashi, Ryosuke; Pudalov, V. M.; Oganov, Artem R.

doi:10.1016/j.mattod.2021.03.025

Cited by 181 publications

(155 citation statements)

References 65 publications

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“…We do not see any transitions that would be associated with an LaH x structure close to x = 8 as seen in the X-ray and, therefore, we conclude that we have a higher order superhydride with T c onset of 556 K. Our observations provide evidence of superconductivity in a metastable compound, perhaps analogous to recent calculations for the Li-Mg-H system in which T c of 470 K has been predicted within a conventional BCS framework. Recent work on a La-Y hydride ternary (Semenok et al, 2021) and the C-S-H system reported by Snider et al (2020a) support our discussions and a trend towards room temperature and even higher temperature superconductors.…”

Section: Discussionsupporting

confidence: 90%

Hot Hydride Superconductivity Above 550 K

Grockowiak

Ahart

Helm

et al. 2022

Front. Electron. Mater

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The search for room temperature superconductivity has accelerated in the last few years driven by experimentally accessible theoretical predictions that indicated alloying dense hydrogen with other elements could produce conventional superconductivity at high temperatures and pressures. These predictions helped inform the synthesis of simple binary hydrides that culminated in the discovery of the superhydride LaH10 with a superconducting transition temperature Tc of 260 K at 180 GPa. We have now successfully synthesized a metallic La-based superhydride with an initial Tc of 294 K. When subjected to subsequent thermal excursions that promoted a chemical reaction to a higher order system, the Tc onset was driven irreversibly to 556 K. X-ray characterization confirmed the formation of a distorted LaH10 based backbone that suggests the formation of ternary or quaternary compounds with substitution at the La and/or H sites. The results provide evidence for hot superconductivity, aligning with recent predictions for higher order hydrides under pressure.

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Section: Discussionsupporting

confidence: 90%

Hot Hydride Superconductivity Above 550 K

Grockowiak

Ahart

Helm

et al. 2022

Front. Electron. Mater

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“…Moreover, as we have shown previously, no significant increase in TC is observed in the La-Y system, which can be considered as the absence of the influence of nonmagnetic yttrium impurities on the superconducting properties of LaH10. 18 This corresponds to so-called Anderson's theorem, 12,72 which states that BCS superconductors are practically insensitive to small amount of nonmagnetic impurities. If the leading mechanism in compressed polyhydrides is the electron-phonon interaction, as most experimental and theoretical studies suggest, 73,74 then it is impossible to expect a significant effect of small additives, such as C or CH4 in H3S, 75,76 on superconductivity.…”

Section: Discussionmentioning

confidence: 99%

Effect of paramagnetic impurities on superconductivity in polyhydrides: s-wave order parameter in Nd-doped LaH10

Semenok

Troyan

Sadakov

et al. 2022

Preprint

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Polyhydrides are a novel class of superconducting materials with extremely high critical parameters, which is very promising for applications. On the other hand, complete experimental study of the magnetic phase diagram for the best so far known superconductor, lanthanum decahydride LaH10, encounters a serious complication because of the large upper critical magnetic field HC2(0), exceeding 120–160 T. Partial replacement of La atoms by magnetic Nd atoms results in a decrease of the upper critical field, which makes it attainable for existing pulse magnets. We found that addition of neodymium leads to significant suppression of superconductivity in LaH10: each atomic % of Nd causes decrease in TC by 10–11 K. Using strong pulsed magnetic fields up to 68 T, we constructed the magnetic phase diagram of the ternary (La,Nd)H10 superhydride, which appears to be surprisingly linear with HC2 ∝ |T – TC|. The pronounced suppression of superconductivity in LaH10 by magnetic Nd atoms and the robustness of TC with respect to nonmagnetic impurities (e.g., Y, Al, C) under Anderson’s theorem indicate the isotropic (s‑wave) character of conventional electron-phonon pairing in the synthesized superhydrides.

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“…This idea has driven subsequent efforts on studying the hydrides, eventually leading to the discovery of superconductivity above 200 K, first in H 3 S (T c of 203 K) [8] and more recently in LaH 10 (T c up to 260 K) [9,10] and a carbonaceous sulfur hydride (CSH) (T c of 288 K) [11]. Since 2015, superconductivity has been reported in the following compounds at high pressure: PH x above 100 K under 207 GPa [12], YH x at 243 K above 200 GPa [13,14], ThH x at 161 K under 175 GPa [15], PrH x at 9 K under 130 GPa [16], LaYH x at 253 K under 183 GPa [17], CeH x at 115-120 K under 95 GPa [18], SnH x at 70 K under 200 GPa [19], BaH x around 20 K under 140 GPa [20], CaH x at 215 K under 172 GPa [21], ScH x at 22.4 K under 156 GPa, and LuH x at 15 K under 128 GPa [22]. The experiment conditions and results are summarized in the Table 1.…”

Section: Introductionmentioning

confidence: 99%

Future Study of Dense Superconducting Hydrides at High Pressure

2021

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The discovery of a record high superconducting transition temperature (Tc) of 288 K in a pressurized hydride inspires new hope to realize ambient-condition superconductivity. Here, we give a perspective on the theoretical and experimental studies of hydride superconductivity. Predictions based on the BCS–Eliashberg–Midgal theory with the aid of density functional theory have been playing a leading role in the research and guiding the experimental realizations. To date, about twenty hydrides experiments have been reported to exhibit high-Tc superconductivity and their Tc agree well with the predicted values. However, there are still some controversies existing between the predictions and experiments, such as no significant transition temperature broadening observed in the magnetic field, the experimental electron-phonon coupling beyond the Eliashberg–Midgal limit, and the energy dependence of density of states around the Fermi level. To investigate these controversies and the origin of the highest Tc in hydrides, key experiments are required to determine the structure, bonding, and vibrational properties associated with H atoms in these hydrides.

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Superconductivity at 253 K in lanthanum–yttrium ternary hydrides

Cited by 181 publications

References 65 publications

Hot Hydride Superconductivity Above 550 K

Hot Hydride Superconductivity Above 550 K

Effect of paramagnetic impurities on superconductivity in polyhydrides: s-wave order parameter in Nd-doped LaH10

Future Study of Dense Superconducting Hydrides at High Pressure

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Superconductivity at 253 K in lanthanum–yttrium ternary hydrides

Cited by 181 publications

References 65 publications

Hot Hydride Superconductivity Above 550 K

Hot Hydride Superconductivity Above 550 K

Effect of paramagnetic impurities on superconductivity in polyhydrides: s-wave order parameter in Nd-doped LaH10

Future Study of Dense Superconducting Hydrides at High Pressure

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Product

Resources

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Superconductivity at 253 K in lanthanum–yttrium ternary hydrides