1. Advanced Light Source, Lawrence Berkeley National Laboratory 1 , Berkeley, California 94720, USA
2. Department of Physics, University of South Florida 2 , Tampa, Florida 33620, USA
3. Department of Physics and Astronomy, Molecular and Condensed Matter Physics, Uppsala University 3 , Uppsala, Sweden
4. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base 4 , Ohio 45433, USA
5. KBR 5 , Beavercreek, Ohio 45431, USA
6. Geballe Laboratory for Advanced Materials, Stanford University 6 , Stanford, California 94305, USA
7. Department of Applied Physics, Stanford University 7 , Stanford, California 94305, USA
8. Department of Physics, Virginia Tech 8 , Blacksburg, Virginia 24061, USA