Affiliation: | 1. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH (UK), Fax: (+44)?1865‐283333;2. Materials Science Centre, University of Manchester, Grosvenor Street, Manchester, M1 7HS (UK);3. JEOL Ltd. 1‐2 Mushashino 3‐Chome, Akishima, Tokyo 196 (Japan);4. Department of Physics, Tokyo Institute of Technology, 2‐12‐1‐H‐51 Oh‐okayama, Meguro‐ku, Tokyo 152‐8551 (Japan), CREST Japan Science and Technology Corporation, Kawaguchi, Saitama 332‐0012 (Japan) |