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Zenodo
2026
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| Accesso online: | https://doi.org/10.5281/zenodo.20261022 |
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| _version_ | 1866902040815337472 |
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| author | Al-Zawahreh, Mohamad |
| author_facet | Al-Zawahreh, Mohamad |
| contents | <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> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_20261022 |
| institution | Zenodo |
| language | |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Cross-Channel Vertex Corrections in Multi-Boson Superconductors: A Coupling-Level Bridge Mechanism for High-Temperature Superconductivity Al-Zawahreh, Mohamad <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> |
| title | Cross-Channel Vertex Corrections in Multi-Boson Superconductors: A Coupling-Level Bridge Mechanism for High-Temperature Superconductivity |
| url | https://doi.org/10.5281/zenodo.20261022 |