1. Department
of Material Science and Engineering, Tokyo Institute of Technology, 2-12-1-H-51 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan
2. JST−CREST, 7-Gobancho, Chiyoda-ku, Tokyo 102-0075, Japan
3. Research
Center for Ultra HVEM, Osaka University, 7-1 Mihokaoka, Ibaraki 567-0047, Japan
4. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1, Tsukuba 305-8568, Japan
5. Department
of Material Science and Engineering, Tokyo Institute of Technology, G1-1 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan