-wave superconducting gap observed in protect-annealed electron-doped cuprate superconductors PrLaCeCuO
arXiv:1905.06024 · doi:10.1103/PhysRevB.100.054517
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 PrLaCeCuO and directly investigated the superconducting gap. The gap was found to be consistent with -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.
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