1. Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
2. Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725-2090, USA
3. Department of Nuclear Engineering, Texas A&M University, College Station, Texas 77843-3128, USA
4. College of Mines and Earth Sciences, University of Utah, Salt Lake City, Utah 84112, USA
5. Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA