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1.武汉大学
2.华中理工大学
收稿日期:1988-11-17,
纸质出版日期:1989-07
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王少阶, 李晓华, 陈义龙, 等. 用正电子湮没研究Y-Ba-Cu-O超导体中的结构不稳定性[J]. Nuclear Techniques, 1989,12(7):387-390.
Shaojie Wang, Xiaohua Li, Yilong Chen, et al. STRUCTURAL INSTABILITIES IN SUPERCONDUCTOR Y-Ba-Cu-O STUDIED BY POSITRON ANNIHILATION[J]. 核技术, 1989, 12(7): 387-390.
本文测量了在100-300K之间随着温度变化的Y-Ba-Cu-O的正电子寿命和多普勒展宽
发现正电子寿命和S参数在130K和260K附近有异常的变化
这意味着与超导相变有关
并认为这些结果是与氧空位的有序度的再调整引起的晶格不稳性相联系.
The positron lifetime and Doppler broadening were measured as a function of temperature between 100K and 300K for Y-Ba-Cu-O superconductor. There are anomalous changes in the positron lifetimes and S parameters near 130K and 260K which imply that some phase transitions related to superconductivity happenned there. The results were discussed in terms of the lattice instabilities which may caused by the ordering readjustment of oxygen vacancies.
C. W. Chu et al . , Phys. Rev. Let. , 58 ( 1987 ), 405 .
Zhao Zhongxian et al . , Int. J. Mod. Phys. , B1 ( 1987 ), 179 .
He Yusheng , ibid , B1 ( 1987 ), 351 .
Wang Yening et al . , J. Phys. , C20 ( 1987 ), L665 .
Chen yilong et al . , Submited to:"Int. conf. on mössbauer effect applidation" , ( Budapest , 1989 ).
P. Kirkegadd and M. Eldrup , Comp. Phys. Commun. , 7 ( 1974 ), 401 .
Y. C. Jean et al . , Phys. Rev. , B , 36 ( 1987 ), 3998 .
S. J. Wang et al . , ibid , 37 ( 1988 ), 603 .
He Yusheng et al . , Proceedings of 2nd conference on high-Tc superconductor , Apr. 1—5 , Baoji, China , p. 137 .
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