1. 1) P. Khalifah, R. W. Erwin, J. W. Lynn, Q. Huang, B. Batlogg and R. J. Cava, Phys. Rev. B, 60, 9573–9578 (1999).
2. 2) F. Wiss, N. P. Raju, A. S. Wills and J. E. Greedan, Int. J. Inorg. Mater., 2, 53–59 (2000).
3. 3) D. Harada and Y. Hinatsu, J. Solid State Chem., 158, 245–253 (2001).
4. 4) D. Harada, Y. Hinatsu and Y. Ishii, J. Phys.-Condens. Mat., 13, 10825–10836 (2001).
5. 5) D. Harada and Y. Hinatsu, J. Solid State Chem., 164, 163–168 (2002).