Maximum Pinning Energy of Vortices in Anisotropic and Layered Superconductors
Maximum Pinning Energy of Vortices in Anisotropic and Layered Superconductors
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各向异性和层状超导体中涡旋的最大钉扎能
DOI：
10.1209/0295-5075/18/7/011
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发表时间：
1992
期刊：
影响因子：
1.8
通讯作者：
E. Brandt
中科院分区：
文献类型：
--
作者：
E. Brandt
在II型超导体中，决定临界电流密度Jc的钉扎力和决定热激活脱钉扎的钉扎能U原则上是不同的量。高能重离子辐照产生的长钉扎通道，在YBCO中可以提高Jc和U，但在强层状BSCCO中，它们可以提高Jc而不提高U，因为层中的饼状涡旋单独地depin。这就是为什么在BSCCO中，磁通蠕变在相当低的温度下很大的原因。
In type-II superconductors the pinning force which determines the critical current density Jc, and the pinning energy U which determines thermally activated depinning, in principle are different quantities. Long pinning channels generated by high-energy heavy-ion irradiation, in YBCO can enhance both Jc and U, but in the strongly layered BSCCO they may enhance Jc without enhancing U, since the pancake vortices in the layers depin individually. This is the reason why in BSCCO flux creep is large down to rather low temperatures.