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Crystallographic evolution and superconductivity in the La1.85−xPrxSr0.15CuO4 system (0 ≤ x ≤ 1.85)

In our comprehensive crystallographic investigation of the La1.85−xPrxSr0.15 CuO4 system (0 ≤ x ≤ 1.85), we observe the structural phase evolution T → T + T′ → T′ with increasing Pr substitution. In the La1.85−xPrxSr0.15CuO4 system, the suppression of the superconductivity is not related to the interaction of the Pr ions with the O ions in the CuO2 plane which leads to the localization of hole carriers. It is the removal of apical oxygen from the (La, Pr)–O plane that is responsible for the suppression of the superconductivity.