Tang Cenyao, Lin Zefeng, Gao Shunye, Zhao Jin, Guo Xingchen, Rao Zhicheng, Zhong Yigui, Feng Xilin, Guan Jianyu, Huang Yaobo, Qian Tian, Chen Weiqiang, Weng Zhengyu, Ding Hong, Jiang Kun, Jin Kui, Sun Yujie
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Nano Lett. 2025 Jun 4;25(22):9024-9031. doi: 10.1021/acs.nanolett.5c01385. Epub 2025 May 22.
Landau's Fermi liquid theory offers a profound understanding of conduction electrons in metals. However, many strongly correlated materials, including heavy-fermions, cuprates, iron-based superconductors, and nickelates, exhibit non-Fermi liquid (NFL) behavior. A hallmark is the strange metal state, characterized by linear-in-temperature resistivity and a linear-in-energy single-particle decay rate. Using angle-resolved photoemission spectroscopy measurements, we systematically investigate electron-doped cuprate LaCeCuO (LCCO) to explore the doping, momentum, and temperature dependence of the self-energy. We observe robust linear-in-energy single-particle scattering across almost the entire momentum space, persisting at high doping levels and temperatures. The extended strange metal behavior suggests a unified normal state, in contrast to an adjacent pseudogap regime in the hole-doped cuprates. This indicates that the physics of the strange metal may be key to high- superconductivity, making LCCO an ideal system for exploring quantum criticality and offering new insights into the microscopic mechanisms for high- superconductivity.
朗道的费米液体理论为理解金属中的传导电子提供了深刻的见解。然而，许多强关联材料，包括重费米子、铜酸盐、铁基超导体和镍酸盐，都表现出非费米液体（NFL）行为。一个标志是奇异金属态，其特征是电阻率与温度呈线性关系以及单粒子衰变率与能量呈线性关系。利用角分辨光电子能谱测量，我们系统地研究了电子掺杂的铜酸盐LaCeCuO（LCCO），以探索自能的掺杂、动量和温度依赖性。我们观察到在几乎整个动量空间中存在稳健的与能量呈线性关系的单粒子散射，这种散射在高掺杂水平和温度下仍然存在。与空穴掺杂铜酸盐中相邻的赝能隙区域形成对比，扩展的奇异金属行为表明存在一个统一的正常态。这表明奇异金属的物理性质可能是高温超导的关键，使得LCCO成为探索量子临界性的理想体系，并为高温超导的微观机制提供了新的见解。
