[1] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA
[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[3] Florida State Univ, Dept Chem & Biochem, Tallahassee, FL 32306 USA
[4] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA
[5] NIST, Ctr Nanoscale Sci & Technol, Gaithersburg, MD 20878 USA
[6] Fudan Univ, State Key Lab Surface Phys, Minist Educ, Key Lab Computat Phys Sci, Shanghai 200433, Peoples R China
[7] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
[8] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[9] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA