1. Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, United States
2. Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States
3. Leibniz Institute for Solid State and Materials Research, IFW-Dresden, Helmholtzstr. 20, 01069 Dresden, Germany
4. Department of Mechanical Engineering, University of Houston, Houston, Texas 77204, United States
5. Program of Material Science and Engineering, University of Houston, Houston, Texas 77204, United States
6. Key Laboratory of Fluid and Power Machinery of Ministry of Education & Center for Advanced Materials and Energy, Xihua University, Chengdu, Sichuan 610039, China