1. Department of Applied Chemistry, Graduate School of Science and Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
2. Research Unit for Power Generation and Storage Materials, Ehime University, Matsuyama, Ehime 790-8577, Japan
3. Research Unit for Development of Organic Superconductors, Ehime University, Matsuyama, Ehime 790-8577, Japan