Evidence for superior current carrying capability of iron pnictide tapes under hydrostatic pressure
Evidence for superior current carrying capability of iron pnictide tapes under hydrostatic pressure
复制标题
DOI：
10.1103/physrevmaterials.1.044805
复制
发表时间：
2017-09
影响因子：
3.4
通讯作者：
Babar Shabbir;He Huang;C. Yao;Yanwei Ma;S. Dou;T. Johansen;H. Hosono;Xiaolin Wang
中科院分区：
文献类型：
--
作者：
Babar Shabbir;He Huang;C. Yao;Yanwei Ma;S. Dou;T. Johansen;H. Hosono;Xiaolin Wang
高临界电流密度值的超导线/带是高磁场应用所需要的。最近开发的磷属元素化物线/带表现出优异的超导性能，例如高临界温度、上临界场和几乎与场无关。然而，尽管做出了巨大的制造努力，但新发现的磷属元素化物线/带仍然不能取代低温超导体，例如，由于它们的超导体价值。银包层带材已经显示出显著的超导性能，尽管它们的低超导性能仍然是一个主要的挑战。通过成功地利用静水压力，在低场和高场的磁带中，可以实现一个数量级的显著增强。这是朝着高场应用迈出的有希望的技术一步，因为在4.2 K和13 T下获得的记录高值优于和其他磷属元素化物线/带。由于缺乏流体静压下的输运测量设备，我们在这里使用了磁力数据与其他已报道的输运数据进行比较。我们的系统分析表明，压力引起的钉扎中心是增强的主要来源，沿着的部分贡献来自于压力下晶界周围的几何变化。我们希望利用适当的压力方法将是一种方法，以显着提高到超过截止（最大）值，在各种超导体生产使用其他现有的方法forenhancement。
High critical current densityvalues in superconducting wires/tapes are desirable for high magnetic field applications. Recently developed pnictide wires/tapes exhibit exceptional superconducting properties such as high critical temperature, upper critical field, and almost field-independent. Despite the great fabrication efforts, however, the newly discovered pnictide wires/tapes are still not able to replace low-temperature superconductors such as, due to their inferiorvalues. Ag-cladtapes have demonstrated significant superconducting performance, although their lowin comparison tois still a major challenge. By successfully employing hydrostatic pressure, a remarkably significant enhancement ofby an order of magnitude can be achieved intapes in both low and high fields. This is a promising technological step forward towards high-field applications, as the record highvaluesat 4.2 K and 13 T,obtained fortape are superior to those ofand other pnictide wires/tapes. Here, we used magneticdata for comparison to the other reported transportdata, due to the lack of transport measurement facility under hydrostatic pressure. Our systematic analysis shows that pressure-induced pinning centers are the main source ofenhancement, along with a fractional contribution from geometric changes around the grain boundaries under pressure. We expect that utilization of an appropriate pressure approach will be a way to significantly enhanceto beyond the cutoff (maximum) values in various superconductors produced using other existing methods forenhancement.