Evidence of Phonon‐Mediated Superconductivity in LaH<sub>10</sub> at High Pressure

Durajski, A. P.; Wang, Chongze; Li, Yinwei; Szczȩśniak, R.; Cho, Jun-Hyung

doi:10.1002/andp.202000518

Cited by 13 publications

(4 citation statements)

References 68 publications

(87 reference statements)

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“…However, if we assume that C2/m-SnH 12 (P = 190 GPa) has the Coulomb pseudopotential parameter, μ * = 0.13, which is weighted average value within many first principle calculations of NRTS materials (where μ * = 0.10-0.16 [5,6,9,10,18,25,29,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71]), and, what is more important, that μ * = 0.13 was one of probable values used by Mahdi Davari Esfahani et al [29] in their predictive calculations for C2/m-SnH 12 phase, than the ratio of k B •T c…”

Section: Comparison Of C2/m-snh 12 With Conventional Superconductorsmentioning

confidence: 99%

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

Talantsev

2021

J. Phys.: Condens. Matter

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Satterthwaite and Toepke (1970 Phys. Rev. Lett. 25 741) predicted high-temperature superconductivity in hydrogen-rich metallic alloys, based on an idea that these compounds should exhibit high Debye frequency of the proton lattice, which boosts the superconducting transition temperature, T c. The idea has got full confirmation more than four decades later when Drozdov et al (2015 Nature 525 73) experimentally discovered near-room-temperature superconductivity in highly-compressed sulphur superhydride, H3S. To date, more than a dozen of high-temperature hydrogen-rich superconducting phases in Ba–H, Pr–H, P–H, Pt–H, Ce–H, Th–H, S–H, Y–H, La–H, and (La, Y)–H systems have been synthesized and, recently, Hong et al (2021 arXiv:2101.02846) reported on the discovery of C2/m-SnH12 phase with superconducting transition temperature of T c ∼ 70 K. Here we analyse the magnetoresistance data, R(T, B), of C2/m-SnH12 phase and report that this superhydride exhibits the ground state superconducting gap of Δ(0) = 9.2 ± 0.5 meV, the ratio of 2Δ(0)/k B T c = 3.3 ± 0.2, and 0.010 < T c/T F < 0.014 (where T F is the Fermi temperature) and, thus, C2/m-SnH12 falls into unconventional superconductors band in the Uemura plot.

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Section: Comparison Of C2/m-snh 12 With Conventional Superconductorsmentioning

confidence: 99%

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

Talantsev

2021

J. Phys.: Condens. Matter

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“…Because of the need for very dense k-and q-point samplings to obtain converged calculations (among other difficulties), the superconducting properties of the larger phases have remained elusive until recently. However, motivated by the developments in hydrogen-rich materials at high pressures that are breaking the records for superconducting temperatures [29][30][31][32][33][34][35][36][37], we recently reported an investigation into the superconducting properties of the C2/c-24 phase [38], and in this study, we focus on the Cmca-12 phase, as well as the Cmca-4 and I4 1 /amd-2 phases.…”

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confidence: 99%

High temperature superconductivity in the candidate phases of solid hydrogen

Cohen

2022

J. Phys.: Condens. Matter

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As the simplest element in nature, unraveling the phase diagram of hydrogen is a primary task for condensed matter physics. As conjectured many decades ago, in the low-temperature and high-pressure part of the phase diagram, solid hydrogen is expected to become metallic with a high superconducting transition temperature. The metallization may occur via band gap closure in the molecular solid or via a transition to the atomic solid. Recently, a few experimental studies pushed the achievable pressures into the 400 – 500 GPa range. There are strong indications that at some pressure in this range metallization via either of these mechanisms occurs, although there are disagreements between experimental reports. Furthermore, there are multiple good candidate crystal phases that have emerged from recent computational and experimental studies which may be realized in upcoming experiments. Therefore, it is crucial to determine the superconducting properties of these candidate phases. In a recent study, we reported the superconducting properties of the C2/c-24 phase, which we believe to be a strong candidate for metallization via band gap closure [M. Dogan et al., arXiv:2107.03889 (2021)]. Here, we report the superconducting properties of the Cmca-12, Cmca-4 and I41/amd-2 phases including the anharmonic effects using a Wannier function-based dense k-point and q-point sampling. We find that the Cmca-12 phase has a superconducting transition temperature that rises from 86 K at 400 GPa to 212 K at 500 GPa, whereas the Cmca-4 and I41/amd-2 phases show a less pressure-dependent behavior with their Tc in the 74 – 94 K and 307 – 343 K ranges, respectively. These properties can be used to distinguish between crystal phases in future experiments. Understanding superconductivity in pure hydrogen is also important in the study of high-Tc hydrides.

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“…Consequently, E F is located in the hydrogen band, and the hydrogen metal state is realized. The coupling between the electrons at E F and the high-frequency hydrogen phonon is proposed to be one of the possible mechanisms of high- T c superconductivity. − As shown in Figure e, the hydrogen metal state may be understood as partial oxidation of H – . HBMx is very shallow, so electrons cannot completely occupy the hydrogen band.…”

Section: Resultsmentioning

confidence: 99%

Extremely Shallow Valence Band in Lanthanum Trihydride

et al. 2022

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Hydride ions (H–) in solvents are chemically active anions with strong electron-donating ability and are used as reducing agents in organic chemistry. Here, we evaluate the energy level of 1s-electrons in H– accommodated in solid lanthanum hydrides, LaH x (2 ≤ x ≤ 3), by photoemission (ultraviolet photoelectron and photoelectron yield spectroscopies) measurements and density functional theory calculations. We show that a very shallow valance band maximum with an ionization potential of 3.8 eV is attained in LaH3 and that the primary cause is attributed to the small electronegativity of hydrogen and the significant bonding–antibonding interaction between neighboring H–s with a close separation originating from the H-stuffed fluorite-related structure. These results encourage the challenge for p-type conduction in hydride semiconductors and provide a clue to the chemical understanding of polyhydride superconductors.

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Evidence of Phonon‐Mediated Superconductivity in LaH₁₀ at High Pressure

Cited by 13 publications

References 68 publications

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

High temperature superconductivity in the candidate phases of solid hydrogen

Extremely Shallow Valence Band in Lanthanum Trihydride

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Evidence of Phonon‐Mediated Superconductivity in LaH10 at High Pressure

Cited by 13 publications

References 68 publications

Comparison of highly-compressed C2/m-SnH12 superhydride with conventional superconductors

Comparison of highly-compressed C2/m-SnH12 superhydride with conventional superconductors

High temperature superconductivity in the candidate phases of solid hydrogen

Extremely Shallow Valence Band in Lanthanum Trihydride

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Product

Resources

About

Evidence of Phonon‐Mediated Superconductivity in LaH₁₀ at High Pressure

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors

Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors