Theory of high-TCsuperconductivity: transition temperature

Dale R Harshman, Anthony T Fiory, John D Dow
2011 Journal of Physics: Condensed Matter  
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 [1]. 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 layers
more » ... and Λ is a universal constant, equal to about twice the reduced electron Compton wavelength (suggesting that Compton scattering plays a role in pairing). Non-optimum compounds in which sample degradation is evident typically exhibit Tc < T_c0. For the 31+ optimum compounds tested, the theoretical and experimental T_c0 agree statistically to within +/- 1.4 K. The elemental high Tc building block comprises two adjacent and spatially separated charge layers; the factor e^2/ζ arises from Coulomb forces between them. The theoretical charge structure representing a room-temperature superconductor is also presented.
doi:10.1088/0953-8984/23/29/295701 fatcat:n22cxuso3jearjbmc7q5fhqp3y