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首页> 外文期刊>Physica, C. Superconductivity and its applications >Transport current characteristics in textured Bi sub(1.84)Pb sub(0.4)Sr sub(2)Ca sub(2)Cu sub(3)O sub(y) silver clamped thick films
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Transport current characteristics in textured Bi sub(1.84)Pb sub(0.4)Sr sub(2)Ca sub(2)Cu sub(3)O sub(y) silver clamped thick films

机译：织构化的Bi sub（1.84）Pb sub（0.4）Sr sub（2）Ca sub（2）Cu sub（3）O sub（y）夹银厚膜的传输电流特性

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摘要

We have measured the field and angular dependencies of critical current density and resistive broadening of a textured Bi sub(1.84)Pb sub(0.4)Sr sub(2)Ca sub(2)Cu sub(3)O sub(y) thick film in applied magnetic field up to 0.3 T, respectively. The field dependence of critical current density at 77 K follows a power law, J sub(c) proportional to H super(-n), with n identical with 0.49 for H parallel ab and 0.62 for H parallel c. The field dependence of characteristic temperature T* determined by different criteria is consistent with `irreversibility line', H(1-T*(H)/T*(0)) super(-3/2). The angular dependence of critical current density at 77 K and magnetic field H identical with 0.1 T can be scaled by effective mass model, J sub(c) proportional to (H(cos super(2) theta / gamma super(2)+sin super(2) theta )) super(-n) with gamma identical with 10 and n identical with 0.49. The angular dependence of characteristic temperature T* can also be fitted by effective mass model to `irreversibility line', T* proportional to (H(cos super(2) theta / gamma super(2)+sin super(2) theta )) super(2/3) with gamma identical with 10, indicating that 3D character in the polycrystalline Bi2223/Ag tape may be correlated with the average misalignment angle of grains. The transport measurements are in good agreement with the `brick wall' model.
机译：我们已经测量了临界电流密度和带纹理的Bi sub（1.84）Pb sub（0.4）Sr sub（2）Ca sub（2）Cu sub（3）O sub（y）厚膜的临界电流密度和电阻展宽的场强和角度依赖性在施加的磁场中分别达到0.3T。临界电流密度在77 K时的场依从性遵循幂定律，J sub（c）与H super（-n）成比例，其中n等于H平行ab的0.49和H平行c的0.62。通过不同标准确定的特征温度T *的场依赖性与“不可逆线” H（1-T *（H）/ T *（0））super（-3/2）一致。临界电流密度在77 K和磁场H等于0.1 T时的角度依赖性可以通过有效质量模型进行缩放，J sub（c）与（H（cos super（2）theta / gamma super（2）+ sin super（2）theta））super（-n），其中gamma等于10，n等于0.49。有效温度模型也可以通过有效质量模型将特征温度T *的角度依赖性拟合为“不可逆线”，T *与（H（cos super（2）theta /γsuper（2）+ sin super（2）theta）成比例） super（2/3）的gamma值等于10，这表明多晶Bi2223 / Ag带中的3D特性可能与晶粒的平均未对准角相关。运输测量与“砖墙”模型非常吻合。

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