1. School of Physics and Electronics, Central South University, Changsha 410083, China 2. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China 3. Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou 310058, China 4. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA 5. Beijing Academy of Quantum Information Sciences, Beijing 100085, China 6. ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
The three-dimensional electronic structure and the nature of Ce 4f electrons of the Kondo insulator CeRu4Sn6 are investigated by angle-resolved photoemission spectroscopy, utilizing tunable photon energies. Our results reveal (i) the three-dimensional k-space nature of the Fermi surface, (ii) the localized-to-itinerant transition of f electrons occurs at a much high temperature than the hybridization gap opening temperature, and (iii) the “relocalization” of itinerant f-electrons below 25 K, which could be the precursor to the establishment of magnetic order.
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