Abstract
For investigation of the oxide superconducting mechanism, a most simple system; La2−xCuO4−y was adopted and multistage phase transitions; including two classes superconducting of Tc1=10−11K, Tc2=35−40K and a diamagnetic transition of Tc3=85−91K were observed in susceptibility and resistivity measurements up to about 90K. The atmospheric oxygen pressure during the sample heat treatment turns out to be essential for those transition-phase growth.
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