RETRACTED: Synthesis of Yttrium Superhydride Superconductor with a Transition Temperature up to 262 K by Catalytic Hydrogenation at High Pressures

Snider, Elliot; Dasenbrock-Gammon, Nathan; McBride, Raymond; Wang, Xiaoyu; Meyers, Noah; Lawler, Keith V.; Zurek, Eva; Salamat, Ashkan; Dias, Ranga

doi:10.1103/physrevlett.126.117003

Cited by 228 publications

(180 citation statements)

References 37 publications

(49 reference statements)

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“…Here, we also discuss the contradictions between different experimental data for the yttrium-hydrogen system. Our preliminary report 25 and the present more comprehensive data are in good agreement with the data from Troyan et al 26 but evidently contradict the claim of T c = 262 K at 182 GPa reported by Snider et al 27 .…”

Section: Introductionsupporting

confidence: 82%

“…5 ). This strong disagreement raises a question about the material studied in Snider et al 27 . Unfortunately, the lack of any X-ray structural characterisation of the samples in Snider et al 27 makes the direct comparison impossible.…”

Section: Resultsmentioning

confidence: 95%

“…This strong disagreement raises a question about the material studied in Snider et al 27 . Unfortunately, the lack of any X-ray structural characterisation of the samples in Snider et al 27 makes the direct comparison impossible. The superconductivity was putatively assigned to P6 3 /mmc YH 9 based on a comparison of the measured and computed Raman spectra 27 .…”

Section: Resultsmentioning

confidence: 95%

“…In the recent report, Snider et al 27 . claimed a significantly higher maximum T c = 262 K at 182(8) GPa in the yttrium-hydrogen system.…”

Section: Resultsmentioning

confidence: 97%

“…Unfortunately, the lack of any X-ray structural characterisation of the samples in Snider et al 27 makes the direct comparison impossible. The superconductivity was putatively assigned to P6 3 /mmc YH 9 based on a comparison of the measured and computed Raman spectra 27 . However, Raman spectroscopy is not a reliable method for the identification of a crystal structure.…”

Section: Resultsmentioning

confidence: 99%

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Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure

et al. 2021

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The discovery of superconducting H3S with a critical temperature Tc∼200 K opened a door to room temperature superconductivity and stimulated further extensive studies of hydrogen-rich compounds stabilized by high pressure. Here, we report a comprehensive study of the yttrium-hydrogen system with the highest predicted Tcs among binary compounds and discuss the contradictions between different theoretical calculations and experimental data. We synthesized yttrium hydrides with the compositions of YH3, YH4, YH6 and YH9 in a diamond anvil cell and studied their crystal structures, electrical and magnetic transport properties, and isotopic effects. We found superconductivity in the Im-3m YH6 and P63/mmc YH9 phases with maximal Tcs of ∼220 K at 183 GPa and ∼243 K at 201 GPa, respectively. Fm-3m YH10 with the highest predicted Tc > 300 K was not observed in our experiments, and instead, YH9 was found to be the hydrogen-richest yttrium hydride in the studied pressure and temperature range up to record 410 GPa and 2250 K.

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Section: Introductionsupporting

confidence: 82%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 95%

“…In the recent report, Snider et al 27 . claimed a significantly higher maximum T c = 262 K at 182(8) GPa in the yttrium-hydrogen system.…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure

et al. 2021

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Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH₂₂

et al. 2022

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experimental metallization limit moving step by step from 150 [4] to 430-500 GPa. [1,5] A consistent increase in pressure leads to a series of phase transitions in solid hydrogen (phases Ι-V [1,5] ), gradual quenching of the Raman signals, and darkening of the sample down to a complete loss of transparency. Despite a significant progress in achieving ultrahigh pressures in the last five years, detecting superconductivity of metallic hydrogen remains an unsolved problem. Studies of the electrical conductivity at pressures above 400 GPa remain very challenging.In 2004, N. Ashcroft suggested that the precompression effects caused by chemical bonding to other atoms may help to convert hydrogen to a metallic state. Fifteen years later, this idea was confirmed in the synthesis of many metallic and superconducting hydrides such as H 3 S, [6,7] LaH 10 , [8,9] YH 6 , [10,11] YH 9 , [11,12] ThH 10 , [13] CeH 9 , [14] PrH 9 , [15] NdH 9 , [16] and so forth. It is believed now that the superconducting properties of these compounds are due to the presence of a sublattice of metallic hydrogen, which is formed in pure hydrogen only at pressures of 500-700 GPa.There must be an intermediate link between these two forms of hydrogen, metallic and superconducting, and a molecular Recently, several research groups announced reaching the point of metallization of hydrogen above 400 GPa. Despite notable progress, detecting superconductivity in compressed hydrogen remains an unsolved problem. Following the mainstream of extensive investigations of compressed metal polyhydrides, here small doping of molecular hydrogen by strontium is demonstrated to lead to a dramatic reduction in the metallization pressure to ≈200 GPa. Studying the high-pressure chemistry of the Sr-H system, the formation of several new phases is observed: C2/m-Sr 3 H 13 , pseudocubic SrH 6 , SrH 9 with cubic F m 43 -Sr sublattice, and pseudo tetragonal superionic P1-SrH 22 , the metal hydride with the highest hydrogen content (96 at%) discovered so far. High diffusion coefficients of hydrogen in the latter phase D H = 0.2-2.1 × 10 −9 m 2 s −1 indicate an amorphous state of the H-sublattice, whereas the strontium sublattice remains solid. Unlike Ca and Y, strontium forms molecular semiconducting polyhydrides, whereas calcium and yttrium polyhydrides are high-T C superconductors with an atomic H sublattice. The discovered SrH 22 , a kind of hydrogen sponge, opens a new class of materials with ultrahigh content of hydrogen.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202200924.

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Effect of Magnetic Impurities on Superconductivity in LaH₁₀

et al. 2022

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Polyhydrides are a novel class of superconducting materials with extremely high critical parameters, which is very promising for sensor applications. On the other hand, a complete experimental study of the best so far known superconductor, lanthanum superhydride LaH10, encounters a serious complication because of the large upper critical magnetic field HC2(0), exceeding 120–160 T. It is found that partial replacement of La atoms by magnetic Nd atoms results in significant suppression of superconductivity in LaH10: each at% of Nd causes a decrease in TC by 10–11 K, helping to control the critical parameters of this compound. Strong pulsed magnetic fields up to 68 T are used to study the Hall effect, magnetoresistance, and the magnetic phase diagram of ternary metal polyhydrides for the first time. Surprisingly, (La,Nd)H10 demonstrates completely linear HC2(T) ∝ |T – TC|, which calls into question the applicability of the Werthamer–Helfand–Hohenberg model for polyhydrides. The 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 gives new experimental evidence of the isotropic (s‐wave) character of conventional electron–phonon pairing in lanthanum decahydride.

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RETRACTED: Synthesis of Yttrium Superhydride Superconductor with a Transition Temperature up to 262 K by Catalytic Hydrogenation at High Pressures

Cited by 228 publications

References 37 publications

Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure

Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH₂₂

Effect of Magnetic Impurities on Superconductivity in LaH₁₀

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RETRACTED: Synthesis of Yttrium Superhydride Superconductor with a Transition Temperature up to 262 K by Catalytic Hydrogenation at High Pressures

Cited by 228 publications

References 37 publications

Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure

Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure

Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH22

Effect of Magnetic Impurities on Superconductivity in LaH10

Contact Info

Product

Resources

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Sr‐Doped Superionic Hydrogen Glass: Synthesis and Properties of SrH₂₂

Effect of Magnetic Impurities on Superconductivity in LaH₁₀