1. Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan, Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow region 142432, Russia, Institute of Solid State Physics RAS, Chernogolovka, Moscow region 142432, Russia, and Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan