1. Department of Materials Science and Engineering, Superconducting Materials Laboratory; Shibaura Institute of Technology; 3-7-5 Toyosu, Koto-ku Tokyo Japan
2. Experimental Physics; Saarland University; Campus C 6 3 Saarbrücken 66123 Germany
3. Department of Mechanical Engineering; Ichinoseki National College of Technology; Takanashi, Hagisho Ichinoseki 021-8511 Japan