d-wave superconducting gap observed in protect-annealed electron-doped cuprate superconductors Pr1.3−xLa0.7CexCuO4
M. Horio, K. Koshiishi, S. Nakata, K. Hagiwara, Y. Ota, K. Okazaki, S. Shin, S. Ideta, K. Tanaka, A. Takahashi, T. Ohgi, T. Adachi, Y. Koike, A. Fujimori
DOI 10.1103/PhysRevB.100.054517 · Physical Review B
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Abstract
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.
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. | 27 | Pressure not reported | unknown |
| Pr1.3-xLa0.7CexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
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