Synthesis of La_2-xNd_xCuO_4+z under High Oxygen Pressure

Abstract

The superconducting La_2-xNd_xCu0_4+z was obtained by being annealed under high oxygen pressure ranging from 0.2atm-60000atm. The oxygen content increases and orthorhombic distortion decreases versus oxygen pressure. For Nd non-doped La₂Cu0_4+z, the Tc value is almost pressure independent which is about 40K. The Nd doping decreases the Tc value but increases the conductivity in the normal conductive region. Nd doped samples show the strong dependence of Tc on the oxygen content. The fraction of superconductive phase drasticaly increases with Nd doping.