Phase diagram of the electron-doped superconductor Pr1-xLaCexCuO4-δ

Systematic measurements of magnetic susceptibility and neutron diffraction were performed on both as-grown and oxygen-reduced single crystals of Pr1-xLaCexCuO4-delta (x = 0.09, 0.11, 0.15 and 0.18) in order to study the electronic phase diagram as functions of both x and delta. Antiferromagnetic ordered phase appears in the x = 0.09 and 0.11 samples for small value of delta at low temperature and degrades by either increasing Ce concentration or delta. Bulk superconductivity was observed in the wider x and delta region compared to that of Nd2-xCexCuO4. A spin-glass-like phase appears in the limited region of delta in between 0.003 and 0.04, which weakly depends on x. Combining both results from susceptibility and neutron scattering measurement, we have obtained x-delta phase diagram of Pr1-xLaCexCuO4-delta. (C) 2003 Published by Elsevier B.V.