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Superconductivity and Madelung potential of YBa2Cu3O6+x ordered superstructures.

The Madelung potential of each possible ordered superlattice of YBa 2 Cu 3 O 6+x is calculated as the oxygen content x varies from zero to 1. ΔV A , the difference in Madelung site potential between apex and in-plane (CuO 2 ) oxygen atoms, is presented as a function of the composition x. The correlation of T c and x is discussed in terms of Ohta's empirical curve of T c vs ΔV A . The theoretical results suggest that the superconductivity depends on the superlattice structure