Angle-resolved photoemission spectroscopy of the low-energy electronic structure of superconducting Pr2CuO4 driven by oxygen nonstoichiometry

Bulk crystals of electron-doped cuprates with a ${T}^{\ensuremath{'}}$-type structure require both Ce substitutions and reduction annealing for the emergence of superconductivity while reduction annealing alone can induce superconductivity in thin films of ${T}^{\ensuremath{'}}$-type cuprates. In order to reveal the low-energy electronic states which are responsible for the superconductivity, we have conducted angle-resolved photoemission spectroscopy measurements on thin films of the superconducting Ce-free ${T}^{\ensuremath{'}}$-type cuprate ${\mathrm{Pr}}_{2}{\mathrm{CuO}}_{4}$. The results indicate that the overall band structure and the Fermi surface area of the superconducting ${\mathrm{Pr}}_{2}{\mathrm{CuO}}_{4}$ are similar to those of superconducting Ce-doped bulk single crystals, highlighting the importance of the actual electron concentration rather than the Ce concentration when discussing the physical properties of ${T}^{\ensuremath{'}}$-type cuprates.