[1
]Organic
Solid Laboratory, CAS Research/Education Center for Excellence in
Molecular
Sciences, CMS & BNLMS, Institute of Chemistry, Chinese Academy of Sciences, Beijing
100190, People’s Republic of China
[2
]ISIS
Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11
0QX, United Kingdom
[3
]Institute
of Condensed Matter and Material Physics, Department of Physics, Peking
University, Beijing 100871, People’s Republic of China
[4
]CAS
Key Laboratory of Standardization and Measurement for Nanotechnology, National
Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China
[5
]State
Key Laboratory of Rare Earth Materials Chemistry and Applications,
BNLMS, College
of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s
Republic of China
[6
]Beijing National
Laboratory for Condensed Matter Physics, Institute of Physics, Chinese
Academy of Sciences, Beijing 100190, People’s Republic of China