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We performed systematic angle-resolved photoemission spectroscopymeasurements $in$-$situ$ on $T'$-${\rm La}_{2-x}{\rm Ce}_x\rm{CuO}_{4\pm\delta}$ (LCCO) thin films over the extended doping range preparedby the refined ozone/vacuum annealing method. Electron doping level ($n$),estimated from the measured Fermi surface volume, varies from 0.05 to 0.23,which covers the whole superconducting dome. We observed an absence of theinsulating behavior around $n \sim$ 0.05 and the Fermi surface reconstructionshifted to $n \sim$ 0.11 in LCCO compared to that of other electron-dopedcuprates at around 0.15, suggesting that antiferromagnetism is stronglysuppressed in this material. The possible explanation may lie in the enhanced-$t'$ /$t$ in LCCO for the largest $\rm{La^{3+}}$ ionic radius among all theLanthanide elements.

Suppression of Antiferromagnetism in Electron-Doped Cuprate $T'$-${\rm La}_{2-x}{\rm Ce}_x\rm {CuO}_{4\pm\delta}$