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Stoichiometric La 2 CuO 4 was chemically oxidized under hydrothermal conditions in KMnO 4 solutions above 100 o C. The structure and superconducting properties of the oxidized La 2 CuO 4+y were studied by X-ray powder diffraction and magnetic susceptibility measurements. A large orthorhombic distortion was observed for the oxidized samples from X-ray diffraction. The oxidized La 2 CuO 4+y shows a high superconducting transition up to 42 K. Chemical oxidation under hydrothermal conditions is effective in inserting oxygen into La 2 CuO 4 because of equilibrium and of higher oxidation temperatures.
Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China Department of Physics, Normal University of Beijing, Beijing 100087, People's Republic of China National Laboratory of Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China Department of Physics, Normal University of Beijing, Beijing 100087, People's Republic of China National Laboratory of Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China Department of Physics, Normal University of Beijing, Beijing 100087, People's Republic of China National Laboratory of Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China