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Persistent supercurrents in MgB2

机译:MgB2中的持续超电流

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Persistent currents were induced in rings of superconducting granular MgB2. We measured the magnetic self-fields generated by these currents using a scanning Hall probe. We obtained both the temperature dependence of the persistent current at the critical level between 15 K and T-c (39 K) and the time decay of the persistent current for up to 10(5) s. The time decay for this time interval is less than 1% at temperatures between 15 and 35 K. This rate is much smaller than that observed in high critical current rings of YBCO thin films, which is about 10% at 15 K. (C) 2003 Published by Elsevier Science B.V. [References: 4]
机译:在超导颗粒MgB2的环中感应出持久性电流。我们使用扫描霍尔探头测量了由这些电流产生的磁场自磁场。我们既获得了在15 K和T-c(39 K)之间的临界水平的持续电流的温度依赖性,也获得了持续电流长达10(5)s的时间衰减。在15到35 K之间的温度下,此时间间隔的时间衰减小于1%。此速率远比YBCO薄膜的高临界电流环中所观察到的速率衰减小,在15 K时约为10%。 2003年由Elsevier Science BV出版[参考文献:4]

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