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| Format: | Recurso digital |
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| Veröffentlicht: |
Zenodo
2026
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| Online-Zugang: | https://doi.org/10.5281/zenodo.20261022 |
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Inhaltsangabe:
- <p>We derive a coupling-level correction to the electron-boson pairing interaction in superconductors with coexisting phonon and spin-fluctuation channels. Starting from the Migdal-Eliashberg framework, we show that the first-order vertex correction generates a cross-channel coupling term γ·λ_ph·λ_sf, where γ = ω_sf/E_F is determined entirely by measurable material properties. The total coupling constant becomes λ_total = λ_ph + λ_sf + γ·λ_ph·λ_sf, which we implement using the unmodified Allen-Dynes equation. We validate this formulation against three independent systems: the anomalous Tc enhancement in monolayer FeSe/SrTiO3 (0.6% error), the suppressed oxygen isotope exponent in optimally doped YBa2Cu3O7, and the self-consistent coupling structure of pressurized La3Ni2O7. We predict an oxygen isotope exponent of α_O = 0.053 for La3Ni2O7 at 25 GPa, providing a falsifiable experimental test. The cross-coupling term is universal but becomes experimentally dominant only in the BCS-BEC crossover regime (E_F ≲ 20 meV).</p>