1. Department
of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
2. European
Synchrotron Radiation Facility, BP 220, F-38047 Grenoble, Cedex, France
3. Canadian Neutron Beam Center, National Research Council of Canada, Chalk River, Ontario, K0J 1J0 Canada
4. Laboratoire
de Physique des Solides Denses, Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
5. Fakultät
Physik/DELTA, Technische Universität Dortmund, Maria-Goeppert-Mayer-Strasse
2, D-44221 Dortmund, Germany
6. Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China