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- W4387096384 abstract "Recent experiments have shown that the phase diagrams of the kagome superconductors $A{mathrm{V}}_{3}{mathrm{Sb}}_{5}$ are strongly impacted by changes in the $c$-axis lattice parameter. Here, we show that $c$-axis deformations impact primarily the Sb apical bonds and thus the overlap between their ${p}_{z}$ orbitals. Changes in the latter, in turn, substantially affect low-energy electronic states with significant Sb character, most notably the central electron pocket and the van Hove singularities located above the Fermi level. Based on the orbital-selective character of $c$-axis strain, we argue that these electronic states experience a non-negligible attractive electron-phonon pairing interaction mediated by fluctuations in the apical Sb bonds. We thus propose a multiband model for superconductivity in $A{mathrm{V}}_{3}{mathrm{Sb}}_{5}$ that includes both the Sb pocket and the V-derived van Hove singularities. Upon comparing the theoretical phase diagram with the experimentally observed vanishing of the ${T}_{c}$ dome across a Lifshitz transition of the Sb pocket, we propose that either an ${s}^{+ensuremath{-}}$ or an ${s}^{++}$ state is realized in $A{mathrm{V}}_{3}{mathrm{Sb}}_{5}$." @default.
- W4387096384 created "2023-09-28" @default.
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- W4387096384 date "2023-09-27" @default.
- W4387096384 modified "2023-10-17" @default.
- W4387096384 title "Superconductivity from orbital-selective electron-phonon coupling in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>A</mml:mi><mml:msub><mml:mi mathvariant=normal>V</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Sb</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W4387096384 doi "https://doi.org/10.1103/physrevb.108.l100510" @default.
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