1. Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA.
2. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
3. Advanced Light Source and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4. Department of Physics, University of California, Berkeley, CA 94720, USA.
5. Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Ibaraki 305-8568, Japan.
6. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan.
7. School of Physics, Suranaree University of Technology and Synchrotron Light Research Institute, Nakhon Ratchasima, 30000 Thailand.
8. Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.