Vortex Phase Dynamics in Yttrium Superhydride YH<sub>6</sub> at Megabar Pressures

Sadakov, A. V.; Власенко, В. А.; Troyan, I. A.; Sobolevskiy, O. A.; Semenok, Dmitrii V.; Zhou, Di; Pudalov, V. M.

doi:10.1021/acs.jpclett.3c01577

Cited by 11 publications

(2 citation statements)

References 38 publications

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“…From 2015 until now, several dozen high-temperature superconducting polyhydride phases have been discovered and studied [1,[12][13][14][15][16][17][18][19][20][21]24,[32][33][34][35][36][37][38][39][40][41][42][43][44][45]. At the same time, highpressure studies of superconductivity and high-pressure material synthesis [46][47][48] in nonhydrides (including cuprates [49][50][51][52]) have also progressed [53][54][55][56][57][58][59][60][61][62], including the observation of T c > 26 K in highly compressed elemental titanium [63,64] and scandium [65,66], and the discovery that T onset c ∼ = 78 K [67,68] and T zero c ∼ = 45 K [69]…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly-Compressed Superconductor

Talantsev¹

2023

Preprint

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Superconductivity in highly-pressurized hydrides became primary direction for the exploration of fundamental upper limit for the superconducting transition temperature, Tc, after Drozdov et al (Nature 2015, 525, 73) discovered superconducting state with Tc=203 K in highly-compressed sulphur hydride. To date several dozens of high-temperature superconducting polyhydrides have been discovered and, recently, it was reported that highly-compressed titanium and scandium exhibit record-high Tc (up to 36 K), which is by manifold exceeded Tc=9.2 K of niobium, which is the record high-Tc ambient pressure metallic superconductor. Here we analysed experimental data on for recently discovered high-pressure superconductors (which exhibit high transition temperatures within their classes): elemental titanium (Zhang et al, Nature Communications 2022; Liu et al, Phys. Rev. B 2022), TaH3 (He et al, Chinese Phys. Lett. 2023), LaBeH8 (Song et al, Phys. Rev. Lett. 2023), and black (Li et al, Proc. Natl. Acad. Sci. 2018) and violet (Wu et al, arXiv 2023) phosphorous, to reveal the nonadiabaticity strength constant, TθTF (where Tθ is the Debye temperature, and TF the Fermi temperature) in these superconductors. The analysis showed that δ-phase of titanium and black phosphorous exhibit the Tθ/TF which are nearly identical to ones associated in A15 superconductors, while studied hydrides and violet phosphorous exhibit the constants in the same ballpark with H3S and LaH10.

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Section: Introductionmentioning

confidence: 99%

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly-Compressed Superconductor

Talantsev¹

2023

Preprint

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Section: Introductionmentioning

confidence: 99%

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly Compressed Superconductors

Talantsev

2023

Symmetry

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Superconductivity in highly pressurized hydrides has become the primary direction for the exploration of the fundamental upper limit of the superconducting transition temperature, Tc, after Drozdov et al. (Nature 2015, 525, 73) discovered a superconducting state with Tc=203 K in highly compressed sulfur hydride. To date, several dozen high-temperature superconducting polyhydrides have been discovered and, in addition, it was recently reported that highly compressed titanium and scandium exhibit record-high Tc (up to 36 K). This exceeded the Tc=9.2 K value of niobium many times over, which was the record-high Tc ambient pressure metallic superconductor. Here, we analyzed the experimental data for the recently discovered high-pressure superconductors (which exhibit high transition temperatures within their classes): elemental titanium (Zhang et al., Nature Communications 2022; Liu et al., Phys. Rev. B 2022), TaH3 (He et al., Chinese Phys. Lett. 2023), LaBeH8 (Song et al., Phys. Rev. Lett. 2023), black phosphorous (Li et al., Proc. Natl. Acad. Sci. 2018; Jin et al., arXiv 2023), and violet (Wu et al., arXiv 2023) phosphorous to reveal the nonadiabaticity strength constant TθTF (where Tθ is the Debye temperature, and TF the Fermi temperature) in these superconductors. The analysis showed that the δ-phase of titanium and black phosphorous exhibits TθTF scores that are nearly identical to those associated with A15 superconductors, while the studied hydrides and violet phosphorous exhibit constants in the same ballpark as those of H3S and LaH10.

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The A-15-type superconducting hydride La₄H₂₃: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity

Talantsev,

Chistyakov

2024

Supercond. Sci. Technol.

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For seven decades by A-15 superconductors we meant metallic A3B alloys (where A is a transition metal, and B is groups IIIB and IVB element) discovered by Hardy and Hulm (Phys. Rev. 89, 884 (1953)). Nb3Ge exhibited the highest superconducting transition temperature, Tc = 23 K, among these alloys. One of these alloys, Nb3Sn, is the primary material in modern applied superconductivity. Recently Guo et al (2024 National Science Reviews nwae149, https://doi.org/10.1093/nsr/nwae149) extended the family of superconductors where the metallic ions arranged in the beta tungsten (A-15) sublattice by observation of Tc,zero = 81 K in La4H23 phase compressed at P = 118 GPa. Despite the La4H23 has much lower Tc in comparison with near-room-temperature superconducting LaH10 phase (Tc,zero = 250 K at P ~ 200 GPa) discovered by Drozdov et al (Nature 569, 531 (2019)), the La4H23 holds the record high Tc within A-15 family. Cross et al (Phys. Rev. B 109, L020503 (2024)) confirmed the high-temperature superconductivity in the compressed La4H23. In this paper, we analyzed available experimental data measured in La4H23 and found that this superconductor exhibits nanograined structure, 5.5 nm ≤ D ≤ 35 nm, low crystalline strain, ε ≤ 0.003, strong electron-phonon coupling interaction, 1.5 ≤ λe-ph≤ 2.55, and moderate level of the nonadiabaticity, 0.18 ≤ ΘD/TF ≤ 0.22 (where ΘD is the Debye temperature, and TF is the Fermi temperature). We found that the derived ΘD/TF and Tc/TF values for the La4H23 phase are similar to the ones in MgB2, cuprates, pnictides, and near-room-temperature superconductors H3S and LaH10.

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Vortex Phase Dynamics in Yttrium Superhydride YH₆ at Megabar Pressures

Cited by 11 publications

References 38 publications

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly-Compressed Superconductor

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly-Compressed Superconductor

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly Compressed Superconductors

The A-15-type superconducting hydride La₄H₂₃: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity

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Vortex Phase Dynamics in Yttrium Superhydride YH6 at Megabar Pressures

Cited by 11 publications

References 38 publications

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly-Compressed Superconductor

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly-Compressed Superconductor

Quantifying the Nonadiabaticity Strength Constant in Recently Discovered Highly Compressed Superconductors

The A-15-type superconducting hydride La4H23: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity

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Vortex Phase Dynamics in Yttrium Superhydride YH₆ at Megabar Pressures

The A-15-type superconducting hydride La₄H₂₃: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity