[1] Univ Tsukuba, Dept Mat Sci, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058573, Japan
[2] Ritsumeikan Univ, Dept Phys Sci, 1-1-1 Noji Higashi, Kusatsu, Shiga 5258577, Japan
[3] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, 4259 Nagatsuta Cho, Yokohama, Kanagawa 2268503, Japan
[4] Hallym Univ, Dept Phys, 1 Hallymdaehakgil, Chunchon 24252, Gangwondo, South Korea