1. Inour Superliquid Glass Project, ERATO, 2-1-1 Yagiyama-minami, Sendai, 982-0807, Japan
2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, 980-8577, Japan
3. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan