[1] Calif State Univ Los Angeles, Los Angeles, CA 90032 USA
[2] Kyoto Univ, Grad Sch Sci, Kyoto, Japan
[3] Natl High Magnet Field Lab, Tallahassee, FL USA
[4] Univ Calif Riverside, Riverside, CA 92521 USA
[5] Max Planck Inst Chem Phys Solids, Dresden, Germany
[6] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands