The enhanced high Tc superconductivity by ordering dopant
POSTER
Abstract
We discuss the high pressure improvement on superconducting transition temperature (Tc) related to ordering apical oxygen layer of a high temperature superconductor (HTS). This study became available in the high pressure synthesized Sr$_{2}$CuO$_{3+\delta }$ superconductor with K$_{2}$NiF$_{4}$ 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.