[1] J. G. Bednorz and K. A. Muller: Z. Phys., 1986, B64, 189. [2] Z. X. Zhao, L. Q. Chen,C. G. Cui, Y. Z. Huang and J. X. Liu: Kexue Tongbao, 1987, 32, 522. [3] Z. X. Zhao, L. Q. Chen, Q. S. Yang,Y. Z. Huang and G. H. Chen: Kexue Tongbao, 1987, 32, 661. [4] C. W. Zhu, P. H. Hor, R. L. Meng, L. Gao and Z. L. Huang: Science, 1987, 235, 567. [5] S. Uchida, H. Takagi, K. Kitazawa and S. Tanaka: Jpn. J. Appl. Phys., 1987, 26, Ll; H. Takagi, S. Uchida, K. Kitazawa and S. Tanaka: Jpn. J. Appl. Phys., 1987, 26, Ll23. [6] Z. X. Zhao, L. Q. Chen, Q. S. Yang,Y. Z. Huang and C. H. Chen: Kexue Tongbao, 1987, 32, 16: 1096. [7] Y. Z. Huang, G. H. Chen, L. Q. Chen,Z. H. Mai and X. Chu: J. of hodern Phys.,B, 1987,1, 1: 199. [8] C. Michel, M. Herview, M. Borel, A. Grandin and F. Deslandes: Z. Phys.,1987,B68, 421. H. Maeda et al.: Jpn. J. Appl.Phys., 1988, 27, L209. [9] Z. X. Zhao, L. Q. Chen, Y. Z. Huang,Z. L. Xiao and Y. M. Ni: Kexue Tongbao, 1988, 32, 817. [10] L. Q. Chen, Y. Z. Huang, Z. L. Xiao, Y. M. Ni and D. N. Zheng: National Conference on High Tc Superconductor, 1-6th April,1988,Baoji,China. [11] Z. Z. Sheng and A. M. Hermann: Nature,1988, 332, 55 and 138. [12] Y. L. Zhang, G. C. Che, J. K. Liang, X. R. Chen and Q. S. Yang: Supercon. Sci. & Technol.,1988, 1,92. [13] Z. X. Zhao, L. Q. Chen,Z. H. Mai, Y. Z. Huang and Z. L. Xiao: Modern Phys. Lett.,B,1988, 2, 479. [14] Z. H. Mai, L. Q. Chen, X. Chu, S. F. Cui and Y. Z. Huang:Supercond. Sci. & Technol.,1988,1,94. [15] G. C. Che et al.: Kexue Tongbao, 1987,32,1097. [16] C. Dong et al.:Beijing International Conference on High Tc Superconductor,29 June to 1 July, 1987, Beijing,China. [17] R. J. Cava et al.: Phys. Rev. Lett.,1987, 58, 1676. [18] R. Beyers et al.:Appl. Phys. Lett.,1987, 50, 1918. [19] S. S. Xie et al.:J. Phys. D, Appl. Phys.,1987, 20, 809. [20] Q. W. Yan et al.: Phys. Rev. B, 1987,36, 5588. [21] Z. H. Mai, L. Q. Chen, X. Chu, D. Y. Dai and Y. M. Ni: Modern Phys., B, 1987, 1, 231. [22] Z. H. Mai, X. Chu and D. Y. Dai: J. of Mat. Sci. Lett.,1988,7,501. [23] H. M. Duan, L. Lu and D. L. Zhang: Chinese Phys. Lett.,1988, 5, 253. [24] H. M. Duan, L. Lu and D. L. Zhang: Solid State Commu.,1988, 67,809. [25] Z. Y. Ran, X. Chu,J. H. Wang, D. N. Zheng and S. L. Jia: Modern Phys. Lett.,B,1988, 2, 699. [26] Y. F. Yan, C. Z. Ci, J. H. Wang, Y. C. Chang and Q. S. Yang: Modern Phys. Lett., B,1988, 2, 571. [27] L. K. Liang, Y. L. Zhang et al.: Scientia Sinica, 1989(1) ,32. [28] D. Y. Yang et al.: Supercon. Sei.Tech- nol., 1988, 1, 100. [29] X. Chu et al.: Midern Phys. Lett.,B, 1988, 2, 985. [30] P. R. Yang et al.:Kexue Tongbao, 1987, 32, 976. [31] W. J. Yeh et al.: Phys. Rev.,B, 1987, 36, 2414. [32] P. W. Anderson: Phys. Rev. Lett., 1962, 9, 309. [33] H. J. Tao, F. Y. Chen,L. Lu, B. R. Zhao and Y. H. Shi: Chinese Phys. Lett., 1987, 4, 481. [34] S. P. Zhao, H. J. Tao, Y. F. Chen, Y. F. Yan and Q. S. Yang: Solid State Commu., 1988,67,1179. [35] J. S. Tsai, I. Takeuchi, J. Fujita, T. Yoshikaka and S. Miura: 5th Int. Workshop and Future Electron Device, June 2 to 4,1988,Tokyo, Japan. [36] H. M. Duan, L. Lu, X. M. Wang, S. Y. Liu and D. L. Zhang: Solid State Commu., 1987, 64, 489. [37] Y. Tokura, H. Takagi and S. Uchida: Nature, 1989, 337, 345. [38] S. P. Zhao, H. J. Tao, Y. F. Chen, G. C. Che and Q. S. Yang: To be published in Modern Phys. Lett. B. [39] Q. Liu et al.: Solid State Commu., 1988, 65, 869. [40] B. Batloff, R. J. Cave et al.: Phys. Rev. Lett., 1988, 59, 2333. [41] L. C. Bourne et al.: Phys. Rev. Lett., 1987, 58, 2337. [42] Q. Z. Ran et al.:Unpublished results. [43] J. H. Wang et al.: Supercon. Sci. & Technol., 1988, 1, 27. [44] P. W. Anderson and Z. Zhon: Phys. Rev. Lett., 1988, 60,132. [45] Z. X. Zhao: Extended Abstracts of Japan-China Oxide High Tc Superconductor Symposium, p12,April 9 to 12, 1989, Tsukuba Center for Institute Tsukuba City, Japan. |