[1] Seoul Natl Univ, CSCMR, Seoul 151747, South Korea
[2] Seoul Natl Univ, Sch Med, Seoul 151747, South Korea
[3] Los Alamos Natl Lab, NHMFL, Los Alamos, NM 87545 USA
[4] Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan
[5] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands
[6] Max Planck Inst Chem Phys Stoffe, D-01187 Dresden, Germany