Magnetic and Superconducting Phase Diagram of Electron-Doped Eu2-xCexCuO4+α-δ

We have investigated the magnetism and superconductivity of the electron-doped Eu_2-xCe_xCuO_4+α-δ in a wide range area of doping Ce⁴⁺ at 0.09 ≤ x ≤ 0.20 by means of magnetic susceptibility measurement at low temperatures down to 2 K. Superconductivity was observed in the concentration of Ce⁴⁺ at 0.12 ≤ x ≤ 0.20 with the range of the reduction of oxygen content 0.0255 ≤ δ ≤ 0.093 with a maximum transition temperature of 12 K. Furthermore, from the data temperature dependence of the dc magnetic-susceptibility, it can be analyzed the Curie constant, atomic magnetic moment and effective magnetic moment in each sample. Those three values have similar values with increasing Ce⁴⁺ concentration for a sample that doesn’t show superconductivity.