[9] A. Zunger and A. J. Freeman, Phys. Rev. B 17 , 1839 (1983). 

[10] K. C. Woo, et al. , Phys. Rev. B 14 , 3242 (1976). 

[11] J. A. Wilson, Solid State Commun. 22 , 551 (1977). 

[12] T. E. Kidd et al. , Phys. Rev. Lett. 88 , 226402 (2002). 

[13] Z. Z. Wang et al. Phys. Rev. B 67 , 121401 (2003). 

[14] K. Shimatake, Y. Toda and S. Tanda, Phys. Rev. B. 75 , 115120 (2007). 

[15] J. Demsar, K. Biljakovi´ c and D. Mihailovic, Phys. Rev. Lett. 83 , 800 (1999). 

[16] J. Demsar, L. Forr´ o, H. Berger and D. Mihailovic, Phys. Rev. B 66 , 041101 (2002). 

[17] S. Tanda, T. Sambongi, T. Tani and S. Tanaka, J. Phys. Soc. Jpn. 53 , 476 (1984). 

[18] S. Tanda and T. Sambongi, Synth. Met. 11 , 85 (1985). 

[19] K. Nakanishi and H. Shiba, J. Phys. Soc. Jpn. 53 , 1103 (1984). 

[20] P. M. Chaikin and T. C. Lubensky, Principles of Condensed Matter Physics (Cambridge, London, 1995). 

