Abstract
Electron-doped Nd 1.85Ce 0.15CuO 4− y superconductors sintered under high pressures and ambient pressure have been investigated by means of resistivity measurements, X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy. The results show that the samples are composed of a near single tetragonal T′ phase. The lattice parameters of the T′ phase increase slightly with the increase of pressure. Lattice distortions and a high density of plane-defects were observed in the high-pressure samples, while few defects were present in the ambient pressure one. The pressure has a positive effect on the T c. The sample with the highest T c value was treated under a pressure of 4.0 GPa and a temperature of 803 K. The role of pressure in the reduction of Nd 1.85Ce 0.15CuO 4− y is explained by the removal of oxygen defects and the enhancement of electron density in the CuO 2 planes.
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