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Frontiers of Physics

ISSN 2095-0462

ISSN 2095-0470(Online)

CN 11-5994/O4

Postal Subscription Code 80-965

2018 Impact Factor: 2.483

Front. Phys.    2008, Vol. 3 Issue (1) : 55-60    https://doi.org/10.1007/s11467-008-0009-z
Studies of synthesizing behaviors and superconductivity of sol-gel YBaCuO samples in flowing oxygen atmosphere
LUO Ting1, ZHANG Yi1, ZHANG Yue-yang1, FENG Qing-rong1, LI Xing-guo2, LIN Li2
1.School of Physics and State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University; 2.School of Chemistry and Molecular Engineering, Peking University
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Abstract Systematic studies of synthesizing behaviors of sol-gel YBa2Cu3O7-x samples in flowing oxygen atmosphere and their superconductivity have been performed. A set of high temperature ?-T curves has been obtained for the whole synthesizing process. After four rounds of synthesizing, the resistivity of the sample was around ? = 1.00 × 10-3 ?cm at room temperature. The ?-T curve of the fourth round shows that the orthorhombic to tetragonal phase transformation of the sample occurs around 600°C, which is lower than that of the YBa2Cu3O7-x sample prepared by conventional solid-state reaction method. Other measurements, such as X-ray diffraction, SEM measurement and low temperature R-T and M-T measurement, were also performed. And the R-T and M-T measurement results suggest that during the synthesizing process, there exist some state at which the sample has better superconductivity than the other states. Moreover, we found screw dislocations presenting on the sample broken surface from the SEM images. This will change the concept that the screw dislocations can only grow on the surface of the YBCO thin films and single crystals.
Issue Date: 05 March 2008
 Cite this article:   
LUO Ting,ZHANG Yi,LIN Li, et al. Studies of synthesizing behaviors and superconductivity of sol-gel YBaCuO samples in flowing oxygen atmosphere[J]. Front. Phys. , 2008, 3(1): 55-60.
 URL:  
https://academic.hep.com.cn/fop/EN/10.1007/s11467-008-0009-z
https://academic.hep.com.cn/fop/EN/Y2008/V3/I1/55
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