High-temperature superconductivity in hydrides

Trojan, Ivan; Semenok, Dmitrii V.; Ivanova, Anna G.; Kvashnin, Alexander G.; Zhou, Di; Sadakov, A. V.; Sobolevsky, Oleg A.; Pudalov, V. M.; Lyubutin, I. S.; Oganov, Artem R.

doi:10.3367/ufne.2021.05.039187

Cited by 34 publications

(18 citation statements)

References 150 publications

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“…[19] This corresponds to so-called Anderson's theorem, [12,80] which states that BCS superconductors are practically insensitive to small amounts of nonmagnetic impurities. If the leading mechanism in compressed polyhydrides is the electron-phonon interaction, as most experimental and theoretical studies suggest, [81,82] then one should not expect a significant effect of small additives, such as C or CH 4 in H 3 S, [83,84] on superconductivity. The opposite situation would be a strong argument in favor of an unconventional pairing mechanism in these compounds.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

Effect of Magnetic Impurities on Superconductivity in LaH₁₀

et al. 2022

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“…And the SQUID method requires exact information about the demagnetizing factor. We believe that these two experimental uncertainties lead to a significant (5–7 times) discrepancy in values of the London penetration depth and related quantities (κ and Gi ; see also ref ).…”

Section: Resultsmentioning

confidence: 98%

Vortex Phase Dynamics in Yttrium Superhydride YH₆ at Megabar Pressures

Sadakov

Власенко

Troyan

et al. 2023

J. Phys. Chem. Lett.

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A comprehensive study of vortex phases and vortex dynamics is presented for a recently discovered high-temperature superconductor YH6 with T c(onset) of 215 K under a pressure of 200 GPa. The thermal activation energy (U 0) is derived within the framework of the thermally activated flux flow (TAFF) theory. The activation energy yields a power law dependence U 0 ∝ H α on magnetic field with a possible crossover at a field around 8–10 T. Furthermore, we have depicted the vortex phase transition from the vortex-glass to vortex-liquid state according to the vortex-glass theory. Finally, vortex phase diagram is constructed for the first time for superhydrides. Very high estimated values of flux flow barriers U 0(H) = (1.5–7) × 104 K together with high crossover fields make YH6 a rather outstanding superconductor as compared to most cuprates and iron-based systems. The Ginzburg number for YH6 Gi = (3–7) × 10–3 indicates that thermal fluctuations are not so strong and cannot broaden superconducting transitions in weak magnetic fields.

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“…Troyan et al. [ 25 ] argued that the NRS experiment [ 22 ] is consistent with the Minkov et al. [ 3–5 ] measurements if the critical current density is J c ∼ 6.8 × 10 7 A/cm 2 ; however, that is an order of magnitude larger than the critical current inferred by Minkov et al.…”

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confidence: 74%

Are hydrides under high-pressure–high-temperature superconductors?

Hirsch

2023

National Science Review

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Contrary to the current consensus, I argue that the existing evidence for high temperature superconductivity in hydrides under high pressure is not compelling. I suggest that the focus of the field should urgently shift to establish unequivocally experimentally whether or not superconductivity in pressurized hydrides exists, instead of continuing to search for new materials that might show elusive signals of unproven superconductivity at ever higher temperatures. The implications of a negative finding for the theoretical understanding of superconductivity are discussed.

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High-temperature superconductivity in hydrides

Cited by 34 publications

References 150 publications

Effect of Magnetic Impurities on Superconductivity in LaH₁₀

Effect of Magnetic Impurities on Superconductivity in LaH₁₀

Vortex Phase Dynamics in Yttrium Superhydride YH₆ at Megabar Pressures

Are hydrides under high-pressure–high-temperature superconductors?

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High-temperature superconductivity in hydrides

Cited by 34 publications

References 150 publications

Effect of Magnetic Impurities on Superconductivity in LaH10

Effect of Magnetic Impurities on Superconductivity in LaH10

Vortex Phase Dynamics in Yttrium Superhydride YH6 at Megabar Pressures

Are hydrides under high-pressure–high-temperature superconductors?

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Product

Resources

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Effect of Magnetic Impurities on Superconductivity in LaH₁₀

Effect of Magnetic Impurities on Superconductivity in LaH₁₀

Vortex Phase Dynamics in Yttrium Superhydride YH₆ at Megabar Pressures