Institution: | (1) Department of Physics, Faculty of Science Kobe University, Rokkodai, Nada, Kobe 657, Japan;(2) Institute for Materials Research, Tohoku University Katahira, 980-77 Sendai, Japan;(3) Superconductivity Research Laboratory, International Superconductivity Technology Center, Shinonome 1-10-13, Koto-ku, 135 Tokyo, Japan;(4) Institute for Solid State Physics, University of Tokyo Roppongi, 106 Tokyo, Japan |