1. Graduate School of Science and Technology, Niigata University, Niigata 950-2181
2. Faculty of Engineering, Niigata University, Niigata 950-2181
3. Institute for Solid State Physics, University of Tokyo, Chiba 277-8581
4. Faculty of Science, Niigata University, Niigata 950-2181
5. Faculty of Science, Kochi University, Kochi 780-8520
6. Center for Advanced Marine Core Research, Kochi University, Kochi 783-8502
7. Graduate School of Science, Nagoya University, Nagoya 464-8602
8. Graduate School of Advanced Science of Matter, Hiroshima University, Hiroshima 739-8530