1. Faculty of Science and Technology, Ryukoku University, Seta, Otsu 520-2194
2. IMR, Tohoku University, Aoba-ku, Sendai 980-8577
3. Faculty of Engineering, Yamagata University, Yonezawa, Yamagata 992-8510
4. LF Vereshchagin Institute of High Pressure Physics, Troisk, Moscow Region, Russia