Abstract
We discussed the high pressure improvement on superconducting transition temperature (Tc) related to the ordering at the apical oxygen layer of a high temperature superconductor (HTS). This study became available in the high pressure synthesized Sr2CuO3+δ superconductor with K2NiF4 structure showing so far rarely formed partially occupied apical oxygen which also act as the dopant of the HTS. The well-defined links between Tc and modulated structures suggests that optimizing the ordering at apical oxygen layer outside CuO2 plane is a promising way to further enhance Tc.
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