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The superconducting transition temperatures of high-Tc compounds based on copper, iron, ruthenium and certain organic molecules are discovered to be dependent on bond lengths, ionic valences, and Coulomb coupling between electronic bands in adjacent, spatially separated layers . Optimal transition temperature, denoted as T_c0, is given by the universal expression k_BT_c0 = e^2 Λ / ℓζ; ℓ is the spacing between interacting charges within the layers, ζ is the distance between interacting layersdoi:10.1088/0953-8984/23/29/295701 fatcat:n22cxuso3jearjbmc7q5fhqp3y