Doping structure of the high temperature superconductor

Abstract

The double doped unit cell of La 2− Ca 1+ Cu 2 O 6+ (LCCO-52) consists of two chemical formulas, La 2 CaCu 2 O 7 and Ca 3 Cu 2 O 6 which are responsible for the occurrence of superconductivity with n = 2 superconducting CuO 2 planes per chemical formula. The distance x between double doped unit cells projected into a CuO 2 plane matches the experimental transition temperature T c quite well.