a
Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow region, Russia
E-mail: konarev@icp.ac.ru
b
Institute of Solid State Physics RAS, Chernogolovka, Moscow region, Russia
c
Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto, Japan
d
Research Institute, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan