1. Department of Applied Chemistry, Graduate School of Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
2. Research Unit for Development of Organic Superconductors, and Research Unit for Power Generation and Storage Materials, Ehime University, Matsuyama, Ehime 790-8577, Japan
3. Department of Materials Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan