Absence of a magnetic-field effect on static magnetic order in the electron-doped superconductor Nd_1.86Ce_0.14CuO₄

Neutron-scattering experiments were performed to study the magnetic-field effect on the electron-doped cuprate superconductor Nd_1.86Ce_0.14CuO₄, which shows the coexistence of magnetic order and superconductivity. The (1/2 3/2 0) magnetic Bragg intensity, which originates from the order of both the Cu and Nd moments at low temperatures, shows no magnetic-field dependence when the field is applied perpendicular to the CuO₂ plane up to 10 T above the upper critical field. This result is significantly different from that reported for the hole-doped cuprate superconductors, in which the quasistatic magnetic order is noticeably enhanced under a magnetic field.