1. Laboratoire de Physique des Solides (CNRS UMR 8502),
2. Japan Science and Technology Corporation, “Nanotubulites” project, Meijo University, Nagoya 468-8502, Japan.
3. Laboratoire Aimé Cotton (CNRS UPR 3321), Université Paris-Sud, Orsay 91405, France.
4. Department of Chemistry, Nagoya University, Nagoya 464-8602, Japan.
5. NEC Corporation, Tsukuba 305-8501, Japan.