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• W2968514714 abstract "$mathrm{A}{mathrm{u}}_{2}mathrm{Pb}$ is a candidate of natural topological superconductors that has attracted much attention in the last few years. Combining ab initio calculations with machine-learning accelerated crystal structure searches, we have found two ground states of $mathrm{A}{mathrm{u}}_{2}mathrm{Pb}$: $Pca{2}_{1}$ phase at ambient pressure and $Ioverline{4}2d$ phase at high pressure. The $Pca{2}_{1}$ phase is energetically more favorable than the known Pbcn structure and can be a candidate for x-ray diffraction refinement; our calculations suggest that high-pressure $Ioverline{4}2d$ is a conventional superconductor. By the high-pressure electric resistance measurements, we observed evidence of a ${T}_{c}$ enhancement. ${T}_{c}$ reaches a maximum value of around 4 K at 5 GPa, then decreases with further compression. The superconductivity can remain unchanged after pressure releasing, in line with our theoretical predictions. These results show that $mathrm{A}{mathrm{u}}_{2}mathrm{Pb}$ exhibits abundant behaviors under varied pressure and temperature, which can help to understand how to adjust its electronic properties by pressure." @default.
• W2968514714 created "2019-08-22" @default.
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• W2968514714 date "2019-08-12" @default.
• W2968514714 modified "2023-10-16" @default.
• W2968514714 title "Ground states of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi mathvariant=normal>A</mml:mi><mml:msub><mml:mi mathvariant=normal>u</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Pb</mml:mi></mml:mrow></mml:math> and pressure-enhanced superconductivity" @default.
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• W2968514714 doi "https://doi.org/10.1103/physrevb.100.060103" @default.
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