Inhomogeneous reduction-annealing effects on the electron-doped cuprate superconductor Pr1.3−xLa0.7CexCuO4 (x=0.08) revealed by microfocused angle-resolved photoemission spectroscopy
M. Miyamoto, M. Horio, K. Moriya, A. Takahashi, J. Osiecki, B. Thiagarajan, C. M. Polley, Y. Koike, T. Adachi, T. Mizokawa, I. Matsuda
DOI 10.1103/PhysRevB.111.125134 · Physical Review B
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Abstract
The development of the protect-annealing method has extended the superconductivity of the electron-doped cuprate Pr1.3−xLa0.7CexCuO4 (PLCCO) into lower Ce concentrations, while the superconducting volume fraction decreases with underdoping. Employing angle-resolved photoemission spectroscopy with a microfocused beam, we investigated the electronic structure of protect-annealed PLCCO (x=0.08) with small superconducting volume fraction. Significant spatial variation of Fermi surface area and shape was observed, suggesting inhomogeneity in electron concentrations and the pseudogap that competes with superconductivity. By performing measurements at dozens of different sample positions, negative and nonmonotonic correlation was found between the electron concentration and pseudogap magnitude. The established correlation illustrates a systematic annealing dependence of the electronic structure where a pseudogap abruptly opens with insufficient oxygen reduction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr1.3-xLa0.7CexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | onset |
| Pr1.3-xLa0.7CexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | midpoint |
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