Abstract
The electrochemical oxidation was tried for La2-xBaxCuO4+2 system, especially in the well-known anomalous composition, x=1/8 where the superconductivity disappears. The samples were oxidized to La2-xBaxCuO4.05 whose superconductivity was perfectly recovered. The low temperature x-ray diffraction study showed that the successive phase transition (THT→OMT→TLT) seen in asprepared samples was perfectly suppressed by the oxygen dope.
