Bond–electromagnetic origin of superconducting pairing across materials

We develop a bond-electromagnetic framework in which superconducting pairing originates from dynamic covalent bonds whose fluctuations generate a real-space pairing kernel. Bond-centered singlets emerge from these structural fluctuations, while long-range superconductivity appears when they become electromagnetically frozen into a phase-coherent network, as quantified by the London kernel and the superfluid stiffness. Within this framework, the microscopic pairing scale [Formula: see text] is determined directly from experimentally accessible structural quantities-including bond geometry, hybridization symmetry, dielectric screening, and the logarithmic bond-frequency moment-through a structural reformulation of the Allen-Dynes expression. The conversion of [Formula: see text] into the observed superconducting transition temperature [Formula: see text] is then governed by the electromagnetic rigidity of the material. Using only structural inputs, the framework reproduces pairing scales across representative materials and coupling regimes. For elemental Al, [Formula: see text] is obtained in a structurally parameter-free manner, while for Pb it is constrained solely by independently established ranges of the coupling strength. To probe structure-driven pairing in systems with reduced phase stiffness, we analyze FeSe under hydrostatic pressure. A structurally constrained form [Formula: see text] naturally captures the pressure-induced rise, maximum, and curvature of the superconducting dome, with the resulting trajectory spanning the experimentally observed transition region from the resistive onset to the zero-resistance state without invoking pressure-dependent spectroscopic input. These results establish a structure-anchored origin of superconducting pairing across distinct materials classes and demonstrate that experimentally accessible bond dynamics provide a practical materials-level criterion for linking lattice structure, electromagnetic response, and superconducting coherence.