Abstract
The kinetic process between the 60 and 90 K superconducting phase transition has been explored to study the oxygen ordering mechanisms. An abrupt change in Tc from 60 to 90 K is observed as the sample’s oxygen content is rapidly varied from around 6.6 to 6.9. No intermediate Tc values are obtained, which suggests an oxygen ordering instability, leading to a phase transition between the 60 and 90 K superconducting phases.
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