1. Department of Applied Chemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005 Japan, Department of Physics, Kumaun University, Nainital 263 002, India, Department of Pharmacy, Chiba Institute of Science, 3 Shiomi-cho, Choshi, Chiba 288-0025 Japan, CSIRO Materials Science and Engineering, Gate 5 Normanby Road, Clayton South, Victoria 3169, Australia, and Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606-8585 Japan