We report the analytical results of Cu valence and the amount of oxygen deficiency in high T c superconductors, Sr x La2-x CuO4-y . These results show that for the sample with x=0, the valence state of all Cu ion is proved to be Cu2+. Amount of Cu3+ and oxygen deficiency linearly increase with increasing Sr. According to this, there is no clear correlation between the transition temperature and the oxygen deficiency.
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Saito et al. (1987) studied this question.
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