  Phase-sensitive order parameter symmetry test experiments are presented on
the electron-doped high-T_c cuprate Nd2-xCexCuO4-y. These experiments have been
conducted using zigzag-shaped thin film Josephson structures, in which the
Nd2-xCexCuO4-y is connected to the low-T_c superconductor Nb via a Au barrier
layer. For the optimally doped as well as for the overdoped Nd2-xCexCuO4-y a
clear predominant dx2-y2-wave behavior is observed at T=4.2K. Both compounds
were also investigated at T=1.6K, presenting no indications for a change to a
predominant s-wave symmetry with decreasing temperature.
