1. Key Lab Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2. Department of Physics and Astronomy, University of California, Irvine, California 92697, United States
3. Magnetic Spectroscopy Group, Diamond Light Source, Didcot OX11 0DE, United Kingdom
4. Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom