1. Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
2. Swiss Light Source, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
3. Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States
4. Experimental Condensed Matter Physics Laboratory, Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus
5. Institute of Inorganic Chemistry, Graz University of Technology, 8010 Graz, Austria
6. IBM Research Europe−Zurich, CH-8803 Rüschlikon, Switzerland