Measurement of electronic structure in van der Waals ferromagnet Fe5-xGeTe2
Kui Huang(黄逵)1,2,3, Zhenxian Li(李政贤)1, Deping Guo(郭的坪)4, Haifeng Yang(杨海峰)1, Yiwei Li(李一苇)1,5, Aiji Liang(梁爱基)1,5, Fan Wu(吴凡)1, Lixuan Xu(徐丽璇)6, Lexian Yang(杨乐仙)6, Wei Ji(季威)4, Yanfeng Guo(郭艳峰)1, Yulin Chen(陈宇林)1,5,7,†, and Zhongkai Liu(柳仲楷)1,5,‡
1 School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China; 2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China; 4 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100190, China; 5 ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China; 6 State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China; 7 Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
Abstract As a van der Waals ferromagnet with high Curie temperature, Fe5-xGeTe2 has attracted tremendous interests recently. Here, using high-resolution angle-resolved photoemission spectroscopy (ARPES), we systematically investigated the electronic structure of Fe5-xGeTe2 crystals and its temperature evolution. Our ARPES measurement reveals two types of band structures from two different terminations with slight kz evolution. Interestingly, across the ferromagnetic transition, we observed the merging of two split bands above the Curie temperature, suggesting the band splitting due to the exchange interaction within the itinerant Stoner model. Our results provide important insights into the electronic and magnetic properties of Fe5-xGeTe2 and the understanding of magnetism in a two-dimensional ferromagnetic system.
Fund: This research used BL03U of Shanghai Synchrotron Radiation Facility and I05 of the Diamond Light Source.We also acknowledge the Analytical Instrumentation Center of ShanghaiTech University for x-ray diffraction and MPMS measurements.Z.K.Liu acknowledges the National Key R&D Program of China (Grant No.2017YFA0305400).
Kui Huang(黄逵), Zhenxian Li(李政贤), Deping Guo(郭的坪), Haifeng Yang(杨海峰), Yiwei Li(李一苇),Aiji Liang(梁爱基), Fan Wu(吴凡), Lixuan Xu(徐丽璇), Lexian Yang(杨乐仙), Wei Ji(季威),Yanfeng Guo(郭艳峰), Yulin Chen(陈宇林), and Zhongkai Liu(柳仲楷) Measurement of electronic structure in van der Waals ferromagnet Fe5-xGeTe2 2022 Chin. Phys. B 31 057404
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