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首页> 外文期刊>IEEE Transactions on Magnetics >MHz band impedance analysis of oxide superconductors (YBCO)
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MHz band impedance analysis of oxide superconductors (YBCO)

机译：氧化物超导体（YBCO）的MHz频带阻抗分析

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Oxide superconductors were investigated by measuring their MHz band impedances. Impedance measurements were performed at 77 K and room temperature. With increase of frequency, impedance at 77 K increased from zero values at 100 kHz. The impedance locus had almost the same form as that for measurements at room temperature, except its starting point. As the density of the specimen increases, the impedance locus changes its form and moves in the clockwise direction. An equivalent circuit is proposed. By a close examination of frequency characteristics at room temperature, a singular frequency was observed which corresponds to the pinning frequency at 77 K. It is concluded that the proposed complex impedance measurement makes it possible to evaluate the material density and the critical current density of oxide superconductors at room temperature.
机译：通过测量兆赫频带阻抗来研究氧化物超导体。阻抗测量是在77 K和室温下进行的。随着频率的增加，在77 K时的阻抗从100 kHz时的零值开始增加。阻抗轨迹的起点几乎与室温下的测量轨迹相同。随着样本密度的增加，阻抗轨迹会改变其形式并沿顺时针方向移动。提出了等效电路。通过仔细检查室温下的频率特性，可以观察到对应于77 K钉扎频率的奇异频率。结论是，建议的复阻抗测量使得可以评估氧化物的材料密度和临界电流密度室温下的超导体。

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