1. Graduate School of Science, Kobe University, Kobe 657-8501, Japan
2. Research Facility Center for Science and Technology, Kobe University, Kobe 657-8501, Japan
3. Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan
4. Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
5. Research Institute for Measurement and Analytical Instrumentation, AIST, Tsukuba, Ibaraki 305-8568, Japan
6. Accelerator Laboratory, KEK, Tsukuba, Ibaraki 305-0801, Japan
7. Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, 38042 Grenoble, France