Superconducting gap and pseudogap in the surface states of the iron-based superconductor PrFeAsO1−y studied by angle-resolved photoemission spectroscopy

superconductor PrFeAsO1−y studied by angle-resolved photoemission spectroscopy K. Hagiwara, ∗ M. Ishikado, M. Horio, K. Koshiishi, S. Nakata, S. Ideta, K. Tanaka, K. Horiba, K. Ono, H. Kumigashira, T. Yoshida, S. Ishida, H. Eisaki, S. Shamoto, 7, 8, 9 and A. Fujimori 10 Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan UVSOR Synchrotron Facility, Institute for Molecular Science, Okazaki, Aichi, 444-8585, Japan Photon Factory, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan Department of Interdisciplinary Environment, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan National Institute of Advanced Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan Japan Atomic Energy Agency (JAEA) , Tokai, Ibaraki 319-1195, Japan Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan Meson Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan Department of Applied Physics, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan (Dated: November 10, 2021)