| YBa2Cu3O6.92超导体光电导效应的正电子实验研究 |
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| 引用本文： | 魏淑桃,康春雷.YBa2Cu3O6.92超导体光电导效应的正电子实验研究[J].光电子技术,1998,18(2):143-148. |
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| 作者姓名： | 魏淑桃 康春雷 |
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| 作者单位： | 河南师范大学!新乡453002 |
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| 基金项目： | 国家超导攀登计划课题，河南省自然科学基金 |
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| 摘 要： | 报道了对光辐照ＹＢａ２Ｃｕ３Ｏ６．９２材料的正电子寿命谱研究结果，给出了正电子寿命参数随辐照时间变化的基本特征，利用两态捕获模型对实验结果进行了初步分析，计算了局域电子密度ｎｅ和空位浓度Ｃｖ随辐照时间的变化，发现光诱导而产生Ｃｕ－Ｏ链区域电子结构的变化，证明Ｏ（１）和Ｏ（５）位之间的氧迁移和重新分布使得氧有序乃是光诱导电性的主要原因，为ＹＢａ２Ｃｕ３Ｏ６．９３体系光电导机理的理解提供了重要的正电子
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| 关 键 词： | 光电导效应 超导体 正电子湮没谱 |
Study on the Photo-irradiation Effect for YBa_2Cu_3O_(6.92) Ceramics by Positron Experiment |
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| Wei Shutao, Kang Chunlei ,Shang Jiaxiang, Cheng Guosheng, Zhang Jincang.Study on the Photo-irradiation Effect for YBa_2Cu_3O_(6.92) Ceramics by Positron Experiment[J].Optoelectronic Technology,1998,18(2):143-148. |
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| Authors: | Wei Shutao Kang Chunlei Shang Jiaxiang Cheng Guosheng Zhang Jincang |
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| Abstract: | The results of positron lifetime forYBa_2Cu_3O_6.92with the different photo-irradiations time is presented. The positron lifetime parameters is given as a function of the irradiation time. Using the two-state trapping model,the local electron dens1ty n, and the vacancy concentration C. are evaluated as a function of the pho to-lrradiat1on time- The electronic structure change in the Cu-O chains region by photo-in duction is found' The effect mechanism of the photo-induction on Y(l23) systems and the relation between the oxygen-order and its re-distribution in Y (123) lattice are also dis ctlssed. |
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| Keywords: | photo-irradiation effect YBa_2Cu_3O_(6 92) ceramics positron lifetime |
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