1. Center for Transdisciplinary Research, Niigata University, Niigata 950-2181, Japan
2. Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
3. Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
4. Center for Science and Technology under Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan
5. National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
6. Department of Physics, Faculty of Science, Niigata University, Niigata 950-2181, Japan