1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695-7907, USA
2. Center for the Study of Matter under Extreme Conditions, Florida International University, Miami, Florida 33199, USA
3. Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA
4. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, USA