Electron Number-Based Phase Diagram Of Pr1-Xlacexcuo4-Delta And Possible Absence Of Disparity Between Electron- And Hole-Doped Cuprate Phase Diagrams

We performed annealing and angle resolved photoemission spectroscopy studies on electron-doped cuprate Pr1-xLaCexCuO4-delta (PLCCO). It is found that the optimal annealing condition is dependent on the Ce content x. The electron number (n) is estimated from the experimentally obtained Fermi surface volume for x = 0.10, 0.15 and 0.18 samples. It clearly shows a significant and annealing dependent deviation from the nominal x. In addition, we observe that the pseudo-gap at hot spots is also closely correlated with n; the pseudogap gradually closes as n increases. We established a new phase diagram of PLCCO as a function of n. Different from the x-based one, the new phase diagram shows similar antiferromagnetic and superconducting phases to those of hole doped ones. Our results raise a possibility for absence of disparity between the phase diagrams of electron-and hole-doped cuprates