  The electron-doped cuprates are usually characterized by a more robust
antiferromagnetic phase and a much narrower superconducting (SC) dome than
those of the hole-doped counterparts. Recently, bulk single crystals of
Pr1.3-xLa0.7CexCuO4-{\delta} (PLCCO) prepared by the protect annealing method
have been studied extensively and revealed many intriguing properties that were
different from those obtained from samples annealed by the conventional
methods. Here, we report on a systematic angle-resolved photoemission
spectroscopy study of PLCCO single crystals after protect annealing. The
results indicate that the actual electron concentration (nFS ) estimated from
the Fermi-surface area is significantly larger than the Ce concentration x and
the new nFS-based SC dome of PLCCO is more extended towards the overdoped side
than the x-based SC dome derived for samples prepared using the conventional
annealing method.
