Anomalous normal-state gap in an electron-doped cuprate

• 成果类型: Article
• 署名作者: Xu, Ke-Jun; He, Junfeng; Chen, Su-Di; He, Yu; Abadi, Sebastien N.; Rotundu, Costel R.; Lee, Young S.; Lu, Dong-Hui; Guo, Qinda; Tjernberg, Oscar; Devereaux, Thomas P.; Lee, Dung-Hai; Hashimoto, Makoto; Shen, Zhi-Xun
• 署名单位: Stanford University; United States Department of Energy (DOE); SLAC National Accelerator Laboratory; Stanford University; Stanford University; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; University of California System; University of California Berkeley; Yale University; Stanford University; Stanford University; United States Department of Energy (DOE); SLAC National Accelerator Laboratory; Royal Institute of Technology; Stanford University; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11417
• DOI: 10.1126/science.adk4792
• 发表日期: 2024-08-16
• 页码: 796-800
• 关键词: t-c; superconductivity; pseudogap

摘要

In the underdoped n-type cuprate Nd2- xCexCuO4, long-range antiferromagnetic order reconstructs the Fermi surface, resulting in a putative antiferromagnetic metal with small Fermi pockets. Using angle-resolved photoemission spectroscopy, we observe an anomalous energy gap, an order of magnitude smaller than the antiferromagnetic gap, in a wide portion of the underdoped regime and smoothly connecting to the superconducting gap at optimal doping. After considering all the known ordering tendencies in tandem with the phase diagram, we hypothesize that the normal-state gap in the underdoped n-type cuprates originates from Cooper pairing. The high temperature scale of the normal-state gap raises the prospect of engineering higher transition temperatures in the n-type cuprates comparable to those of the p-type cuprates.