1. College of Environment and Applied Chemistry, Kyung Hee University, Kyung Ki 449-701, Korea, Department of Geosciences and Mineral Physics Institute, State University of New York, Stony Brook, New York 11794-2100, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1185, and Center for CMR Materials, KRISS, Taejon 305-600, Korea