1. Harima Institute, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
2. Department of Physics, Okayama University, Okayama 700-8530, Japan
3. Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai 599-8531, Japan
4. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-9531, Japan
5. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
6. Kitagawa Integrated Pore Project, ERATO, Japan Science and Technology Agency, Kyoto 600-8815, Japan
7. Institute for Integrated Cell-Material Sciences, Kyoto University, Kyoto 606-8501, Japan