K A I L Wijewardena Gamalath, G.D.K.N. Udeni, Probability Densities of Superconductors, Volume 41, International Letters of Chemistry, Physics and Astronomy (Volume 41)
https://www.scipress.com/ILCPA.41.31
Abstract:
    The energy, current density and momentum probability densities of superconductors were studied from London, Ginzburg-Landau and BSC theories by treating cooper pair as a particle moving in a magnetic field through analytical and numerical techniques. The London and GL solution were exactly the same at the classical limit for <i>NbN</i>. Considering a Cooper pair as a complete classical particle, the momentum probability density was derived by using the Maxwell velocity distribution and the quantum mechanical momentum probability density was derived by using the radial wave function of the cooper pairs for Zn. The quantum mechanical and classical momentum probability densities overlap at zero momentum.
Keywords:
    BSC Theory, Cooper Pair, Current Densities, Ginzburg-Landau Theory, London Theory, Momentum Probability Densities, Superconductors