1. SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, U.K.
2. Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
3. Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, Dresden 01187, Germany
4. Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot OX11 0DE, U.K.
5. Department of Physics, University of Warwick, Coventry CV4 7AL, U.K.
6. Institute for Materials Research, Tohoku University, Sendai 980-08577, Japan
7. MAX IV Laboratory, Lund University, P.O. Box 118, Lund 221 00, Sweden