Faculty of Science and Technology, Ryukoku University, Seta, Otsu 520–21

Faculty of Science and Technology, Ryukoku University, Seta, Otsu 520–21

Low Temperature Center, Osaka University, Machikaneyama–cho, Toyonaka 560

Research Center for Extreme Materials, Osaka University, Machikaneyama–cho, Toyonaka 560

Faculty of Science, Osaka University, Machikaneyama–cho, Toyonaka 560

LF Vereshchagin Institute of High Pressure Physics, Moscow, Russia

LF Vereshchagin Institute of High Pressure Physics, Moscow, Russia