[1] Chiba Univ, Grad Sch Sci & Technol, Chiba 2608522, Japan
[2] RIKEN, Inst Phys & Chem Res, Adv Meson Sci Lab, Wako, Saitama 351098, Japan
[3] Chiba Univ, Fac Sci, Dept Phys, Chiba 2638522, Japan
[4] Tohoku Univ, Inst Mat Res, High Field Lab Superconducting Mat, Sendai, Miyagi 9808577, Japan
[5] Hokkaido Univ, Grad Sch Sci, Div Phys, Sapporo, Hokkaido 0600810, Japan
[6] Muroran Inst Technol, Dept Elect & Elect Engn, Muroran, Hokkaido 0508585, Japan