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We have performed a systematic angle-resolved photoemission study of as-grownand oxygen-reduced Pr$_{2-x}$Ce$_x$CuO$_4$ and Pr$_{1-x}$LaCe$_{x}$CuO$_4$electron-doped cuprates. In contrast to the common belief, neither the bandfilling nor the band parameters are significantly affected by the oxygenreduction process. Instead, we show that the main electronic role of thereduction process is to remove an anisotropic leading edge gap around the Fermisurface. While the nodal leading edge gap is induced by long-rangeantiferomagnetic order, the origin of the antinodal one remains unclear.

Antiferromagnetism-superconductivity competition in electron-doped cuprates triggered by oxygen reduction