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Inhomogeneous reduction-annealing effects on the electron-doped cuprate superconductor Pr1.3-x La0.7CexCuO4 (x=0.08) revealed by microfocused angle-resolved photoemission spectroscopy

Miyamoto, M. ; Horio, M. ; Moriya, K. ; Takahashi, A. ; Osiecki, J. LU ; Thiagarajan, B. LU ; Polley, C. M. LU ; Koike, Y. ; Adachi, T. and Mizokawa, T. , et al. (2025) In Physical Review B 111(12).
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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
111
issue
12
article number
125134
publisher
American Physical Society
external identifiers
  • scopus:105001190793
ISSN
2469-9950
DOI
10.1103/PhysRevB.111.125134
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 American Physical Society.
id
61d35206-52aa-4ea4-9784-9f7ca38b0750
date added to LUP
2025-12-05 11:48:19
date last changed
2025-12-05 11:49:34
@article{61d35206-52aa-4ea4-9784-9f7ca38b0750,
  abstract     = {{<p>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.</p>}},
  author       = {{Miyamoto, M. and Horio, M. and Moriya, K. and Takahashi, A. and Osiecki, J. and Thiagarajan, B. and Polley, C. M. and Koike, Y. and Adachi, T. and Mizokawa, T. and Matsuda, I.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{12}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Inhomogeneous reduction-annealing effects on the electron-doped cuprate superconductor Pr1.3-x La0.7CexCuO4 (x=0.08) revealed by microfocused angle-resolved photoemission spectroscopy}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.111.125134}},
  doi          = {{10.1103/PhysRevB.111.125134}},
  volume       = {{111}},
  year         = {{2025}},
}