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| ON THE HIGH Tc SUPERCONDUCITVITY OF Y-Ba-Cu OXIDE |
| ZHU Naiping; JIANG Xiaoping; PANG Dexing;QI Hongbo; SU Guoyue; ZHANG Ze; YANG Zhongjin; YU Huafeng (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 27 March; 1987) |
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Cite this article:
ZHU Naiping; JIANG Xiaoping; PANG Dexing;QI Hongbo; SU Guoyue; ZHANG Ze; YANG Zhongjin; YU Huafeng (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 27 March; 1987). ON THE HIGH Tc SUPERCONDUCITVITY OF Y-Ba-Cu OXIDE. Acta Metall Sin, 1987, 23(3): 250-252.
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Abstract The supercoductivity and structure of Y-Ba-Cu oxide have been investigated by means of electrical resistance and magnetic susceptibility measurements as well as X-ray diffraction, SEM and electron probe microanalysis. The results show that the onset temperature is 107.6K and the zero resistivity state occures at 94.8K with a width of about 2K for the sample of Ba_3Y_2Cu_5O_(5(3-z)). Diamagnetic susceptibility (Meissncr effect)was observed by magnetic susceptibility measurement, and confirmed with electrical resistance determination. The specimen consists mainly of hexagonal (or rhombohedral) ABO_3-type phase with lattice parameter of a=b=0.550nm, c=1.332nm and space group of R3c of R3m. The particles of oxide well connecte up each other, although quite a large number of pores exist. Zero resistance can be kept while up to 2A/cm~2 current passes through the sample.
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Received: 18 March 1987
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1 Bednorz J G, Mueller K A. Z phys B Condensed Matter, 1986; 64: 189
2 Chu C W, Hot P H, Meng R L et at. Phys Rev Lett, 1987; 58; 405
3 Cava R J, Van Dover R B, Batlogg B, Rietman E A. Phys Rev Lett. 1987: 58: 408
4 赵忠贤,陈立泉,崔长庚,黄玉珍,刘锦湘,陈赓华,李山林,郭树权,何业冶.科学通报,1987;(3) :17 |
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