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POSITRON ANNIHILATION STUDY ON HIGH TC SUPERCONDUCTORS Y-Ba-CU-O |
| ZHU Jingsheng;YANG Zhongjin*;SONG Jian xian;ZHOU Xianyi;WANG Jun;WANG Yanfang |
| University of Science and Technology of China, Hefei
*Institute of Metal Research, Academia Sinica, Shenyang
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| Cite this article: |
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ZHU Jingsheng, YANG Zhongjin, SONG Jian xian et al 1988 Chin. Phys. Lett. 5 181-184 |
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Abstract The Doppler broadening lineshape of 5llkeV gamma rays of positron annihilation radiation in the high Tc superconductors Y-Ba-Cu-O has been investigated. The lineshape parameters as a function of temperature were measured from 85K to 300K. Anomalous dependence of lineshape parameters on temperature was first observed in polyphase samples, i. e., the lineshape parameters occurred catastrophe for some narrow temperature regions (90K. 107K, 115K and 180K). This anomaly is probably due to the migration and redistribution of oxygen vacancies in the samples during superconducting transition.
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Published: 01 April 1988
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