ALEXANDROV, A.S., 2007. Theory of giant and nil proximity effects in cuprate semiconductors. Physical Review B, 75(13), 132501 pp. 1-4.
A number of observations point to the possibility that high-Tc cuprate superconductors may not be conventional
Bardeen-Cooper-Schrieffer superconductors but rather derive from the Bose-Einstein condensation of
real-space pairs, which are mobile small bipolarons. A solution of the Gross-Pitaevskii equation describing
Bose-condensate tunneling into a cuprate semiconductor is analytically found. It accounts qualitatively and
quantitatively for nil and giant proximity effects discovered experimentally in cuprates.