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首页> 外文期刊>IEEE Transactions on Magnetics >Intergranular J/sub c/ determination in toroidal high temperature superconductors using a soft-core closed magnetic circuit
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Intergranular J/sub c/ determination in toroidal high temperature superconductors using a soft-core closed magnetic circuit

机译：使用软芯闭合磁路测定环形高温超导体中的晶间J / sub c /

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An examination of weak-link coupling between grains has been made using a noncontact magnetic technique. Intergranular J/sub c/(T) measurements for unaligned and grain-aligned sintered YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBC) toroids are reported. Supercurrent is deduced from measurement of the net current encircling the core, and J/sub c/ is found from supercurrent saturation in contrast to onset pickup voltage criteria. Agreement with recently reported direct transport measurements on the aligned sample suggests that the conduction mechanism is the same as for direct transport. A universal normalized J/sub c/(T) behavior which follows the same junction critical current temperature dependence previously reported in bicrystal transport measurements is found. It is proposed that this technique may be extended for the measurement of critical currents in thin-film samples and that present bulk intergranular current densities appear to be high enough to produce a soft-material limited superconducting electromagnet at 77 K.
机译：已经使用非接触磁性技术对晶粒之间的弱链接耦合进行了研究。报告了未对准和晶粒对准的烧结YBa / sub 2 / Cu / sub 3 / O / sub 7-x /（YBC）环形磁芯的晶间J / sub c /（T）测量。通过测量围绕铁心的净电流可​​以推导出超电流，并且与启动电压标准相比，可以从超电流饱和中找到J / sub c /。与最近报道的对准样品上的直接运输测量结果一致表明，传导机理与直接运输相同。发现了通用归一化的J / sub c /（T）行为，该行为遵循先前在双晶输运测量中报道的相同的结临界电流温度依赖性。建议将该技术扩展到薄膜样品中的临界电流的测量，并且目前的整体晶间电流密度似乎足够高，以在77 K的条件下产生软材料受限的超导电磁体。

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