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首页> 外文期刊>Journal of Superconductivity >Intergranular critical current density in polycrystalline (Bi-Pb)-2223 high temperature superconductor by ac susceptibility measurements
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Intergranular critical current density in polycrystalline (Bi-Pb)-2223 high temperature superconductor by ac susceptibility measurements

机译：多晶（Bi-Pb）-2223高温超导体的晶间临界电流密度通过磁化率测量

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摘要

The field dependence of real (x') and imaginary (x") component of ac susceptibility of superconductors within the critical state model can conveniently be used for evaluating the critical current when field amplitude is larger than the penetration field. A method to analyze the real (x') and imaginary (x") component of fundamental ac susceptibility with the objective of extracting the temperature dependence of critical current density J{sub}c(T) is reported. The procedure makes use of the ac susceptibility data of two polycrystalline (Bi-Pb)-2223 samples measured with different excitation amplitudes below and close to the critical temperature. The temperature dependence of J{sub}c is extracted using the isothermal scan over x' and x'' data. Results obtained from this procedure are found to be in fair agreement with J{sub}c(T) calculated from traditional "loss-maximum" data.
机译：当场幅大于穿透场时，临界状态模型中超导体的磁化率的实部（x'）和虚部（x“）的场相关性可以方便地用于评估临界电流。报告了基本磁化率的实部（x'）和虚部（x“），目的是提取临界电流密度J {sub} c（T）的温度依赖性。该程序利用在低于和接近临界温度的不同激发幅度下测得的两个多晶（Bi-Pb）-2223样品的磁化率数据。通过对x'和x''数据进行等温扫描来提取J {sub} c的温度依赖性。发现从该程序获得的结果与根据传统“最大损失”数据计算出的J {c}（T）完全一致。

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