Angle-resolved photoemission spectroscopy of the low-energy electronic structure of superconducting Pr${}_2$CuO${}_4$ driven by oxygen non-stoichiometry

Abstract

Bulk crystals of electron-doped cuprates with the T'-type structure require both Ce substitutions and reduction annealing for the emergence of superconductivity while the reduction annealing alone can induce superconductivity in thin films of the T'-type cuprates. In order to reveal 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'-type cuprate Pr${}_2$CuO${}_4$. The results indicate that the overall band structure and the Fermi surface area of the superconducting Pr${}_2$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 the T'-type cuprates.

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Cited by in corpus (12)

• The Strange Metal State of the Electron-Doped Cuprates
• Evolution of charge order topology across a magnetic phase transition in cuprate superconductors
• Extended superconducting dome of electron-doped cuprates after protect annealing revealed by ARPES
• Ce-doping and reduction annealing effects on electronic states in Pr${}_{2-x}$Ce${}_x$CuO${}_4$ studied by Cu $K$-edge X-ray absorption spectroscopy
• Pseudogap in electron-doped cuprates: Strong correlation leading to band splitting
• Superconductivity induced by structural reorganization in the electron-doped cuprate Nd${}_{2-x}$Ce${}_x$CuO${}_4$
• Oxide Fermi liquid universality revealed by electron spectroscopy
• Oxidation annealing effects on the spin-glass-like magnetism and appearance of superconductivity in T*-type La${}_{1-x/2}$Eu${}_{1-x/2}$Sr${}_x$CuO${}_4$ (0.14 $\le x\le$ 0.28)
• Nature of carrier doping in T'-La1.8-xEu0.2SrxCuO4 studied by X-Ray Photoemission and Absorption Spectroscopy
• Post-growth annealing effects on charge and spin excitations in Nd${}_{2-x}$Ce${}_x$CuO${}_4$
• Distinct variation of electronic states due to annealing in La${}_{1.8}$Eu${}_{0.2}$CuO${}_4$ and Nd${}_2$CuO${}_4$
• Inhomogeneous reduction-annealing effects on the electron-doped cuprate superconductor revealed by micro-focused angle-resolved photoemission spectroscopy