Absence of a magnetic-field effect on static magnetic order in the electron-doped superconductor Nd 1.86 Ce 0.14 CuO 4

Neutron-scattering experiments were performed to study the magnetic-field effect on the electron-doped cuprate superconductor ${\mathrm{Nd}}_{1.86}{\mathrm{Ce}}_{0.14}{\mathrm{CuO}}_{4},$ which shows the coexistence of magnetic order and superconductivity. The $(\frac{1}{2}\frac{3}{2}0)$ 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 ${\mathrm{CuO}}_{2}$ 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.