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YBa₂Cu₃O_x红外吸收谱随氧含量变化的研究

VARIATION OF IR ABSORPTION SPECTRA OF YBa₂Cu₃O_x WITH OXYGEN CONTENT

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【Author】 ZHAO YONGGANG, SHI TIANSHENG, GU WEIFANG CAI PEIXIN, FU YAOXIAN, XIE LEIMING (Shanghai Institute of Matallurgy, Academia Sinica, Shanghai, P. E. C.)

【机构】中国科学院上海冶金研究所；中国科学院上海冶金研究所上海；上海；上海；

【摘要】 YBa₂Cu₃O_x红外吸收谱中有两个特征吸收峰P₁(620～642cm^-1)、P₃(540～585cm^-1),它们的频率和YBa₂Cu₃O_x中的氧含量密切相关,并且P₁、P₃吸收峰的频率在不同范围内分别对应YBa₂Cu₃O_x的正交相、四方相及正交相向四方相的过渡。根据实验结果,我们提出了一个简单模型来解释YBa₂Cu₃O_x的T_c值与其氧含量x之间的S形关系曲线。更多还原

【Abstract】 The frequencies of two characteristic IR absorption peaks P₁(620～642cm^-1) andP₃ (540～585cm^-1) are found to be closely related to the oxygen content in YBa₂Cu₃O_x. The different frequency ranges of P₁ and P₃ peaks that correspond to orthorhombic, tetragonal and orthorhombio-tetragonal phases of the material are observed. A simple model based on the experimental results is proposed to explain the S-shaped curve of T_c vs x.更多还原