d-wave superconducting gap observed in protect-annealed electron-doped cuprate superconductors Pr1.3−xLa0.7CexCuO4

For electron-doped cuprates, the strong suppression of antiferromagnetic spin correlation by efficient reduction annealing by the "protect-annealing" method leads to superconductivity not only with lower Ce concentrations but also with higher transition temperatures. To reveal the nature o...

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Bibliographic Details
Published in:Physical review. B 2019-08, Vol.100 (5), p.1
Main Authors: Horio, M, Koshiishi, K, Nakata, S, Hagiwara, K, Ota, Y, Okazaki, K, Shin, S, Ideta, S, Tanaka, K, Takahashi, A, Ohgi, T, Adachi, T, Koike, Y, Fujimori, A
Format: Article
Language:English
Subjects:
Annealing
Antiferromagnetism
Cuprates
Electron spin
Electrons
Photoelectric emission
Superconductivity
Variations
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Summary:For electron-doped cuprates, the strong suppression of antiferromagnetic spin correlation by efficient reduction annealing by the "protect-annealing" method leads to superconductivity not only with lower Ce concentrations but also with higher transition temperatures. To reveal the nature of this superconducting state, we have performed angle-resolved photoemission spectroscopy measurements of protect-annealed electron-doped superconductors Pr1.3−xLa0.7CexCuO4 and directly investigated the superconducting gap. The gap was found to be consistent with d-wave symmetry, suggesting that strong electron correlation persists and hence antiferromagnetic spin fluctuations remain a candidate that mediates Copper pairing in the protect-annealed electron-doped cuprates.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.054517