Experimental Observation of Electronic Structures of Kagome Metal YCr$_{6}$Ge$_{6}$
Pengdong Wang1, Yihao Wang2, Bo Zhang1, Yuliang Li1, Sheng Wang1, Yunbo Wu1, Hongen Zhu1, Yi Liu1, Guobin Zhang1, Dayong Liu3*, Yimin Xiong2*, and Zhe Sun1,4,5*
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China 2Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China 3Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China 4Key Laboratory of Strongly Coupled Quantum Matter Physics, Chinese Academy of Sciences, University of Science and Technology of China, Hefei 230026, China 5CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, China
Abstract：Using angle-resolved photoemission spectroscopy, we study electronic structures of a Kagome metal YCr$_{6}$Ge$_{6}$. Band dispersions along $k_{z}$ direction are significant, suggesting a remarkable interlayer coupling between neighboring Kagome planes. Comparing ARPES data with first-principles calculations, we find a moderate electron correlation in this material, since band calculations must be compressed in the energy scale to reach an excellent agreement between experimental data and theoretical calculations. Moreover, as indicated by band calculations, there is a flat band in the vicinity of the Fermi level at the $\varGamma$–$M$–$K$ plane in the momentum space, which could be responsible for the unusual transport behavior in YCr$_{6}$Ge$_{6}$.
2020, Vol. 37 
