1. Nanomaterials and Devices Laboratory, Department of Physics, University of Houston, Houston, Texas 77204, USA
2. Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA
3. The University of Tokyo, Tokyo, Japan
4. Shinshu University, Nagano, Japan
5. Polna 1a, 05-600 Grójec, Poland
6. Shell Global Solution International, Amsterdam, Netherlands