Fundamental Limits on the Electron-Phonon Coupling and Superconducting T<sub>c</sub>.
basic_science · Level V
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- Also identified by DOI 10.1002/adma.202507013.
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Abstract
Fundamental upper bounds on the electron-phonon interaction strength and superconducting transition temperature T<sub>c</sub> in metals are established based on the intrinsic instability of the equilibrium between electrons and the crystal lattice under strong interaction. This instability explains why observed electron-phonon coupling constants are limited to λ ≲ 4. The theory also accounts for the mechanism of metastable superconductivity with enhanced T<sub>c</sub>, which emerges near the instability threshold. Based on theoretical analysis and comparison with experimental data, room-temperature phonon-mediated superconductivity is found to be feasible exclusively in hydrogen compounds.