$d$-wave superconducting gap observed in the protect-annealed electron-doped cuprate superconductors Pr$_{1.3-x}$La$_{0.7}$Ce$_{x}$CuO$_{4}$. (arXiv:1905.06024v1 [cond-mat.supr-con])

5 years ago

$d$-wave superconducting gap observed in the protect-annealed electron-doped cuprate superconductors Pr$_{1.3-x}$La$_{0.7}$Ce$_{x}$CuO$_{4}$. (arXiv:1905.06024v1 [cond-mat.supr-con])

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

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 on protect-annealed electron-doped superconductors Pr$_{1.3-x}$La$_{0.7}$Ce$_{x}$CuO$_{4}$ and directly investigated the superconducting gap. The gap was found to exhibit $d$-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.

Publisher URL: http://arxiv.org/abs/1905.06024

DOI: arXiv:1905.06024v1