1. Institute of Experimental Physics, Saarland University, Campus C 6 3, 66123 Saarbrücken, Germany
2. Superconducting Materials Laboratory, Department of Materials Science and Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan
3. Institut Jean Lamour, UMR CNRS-Université de Lorraine, 54506 Vandœvre-lès-Nancy, France
4. Groupe de Recherche en Energie Electrique de Nancy (GREEN), Université de Lorraine, 54506 Vandœvre-lès-Nancy, France