[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[2] Univ Buffalo, Dept Phys, Buffalo, NY 14260 USA
[3] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA
[4] Univ Calif Riverside, Mat Sci & Engn, Riverside, CA 92521 USA
[5] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[6] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA