1. Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
2. Stewart
Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC V6T 1Z4, Canada
3. Department
of Physics and Astronomy, University of British Columbia, 6224
Agricultural Road, Vancouver, BC V6T 1Z1, Canada
4. Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany
5. Department
of Physics, University of Alberta, 4-181 CCIS, Edmonton, AB T6G 2E1, Canada
6. Department
of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States
7. TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
8. Shanghai
Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi
Road, Shanghai 200050, P.R. China
9. Department
of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A
1S6, Canada
10. Laboratory
for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland