添加共金属对多晶FeSe0.5Te0.5超导性能和颗粒行为的影响
Cometal addition effect on superconducting properties and granular behaviours of polycrystalline FeSe0.5Te0.5
AI总结：
研究通过固相反应法在多晶FeSe0.5Te0.5中添加微量Pb和Sn颗粒，发现适量添加可提高转变温度1 K并优化临界电流密度与钉扎力，过量则抑制超导渗流。
摘要：
本文介绍了添加微米级Pb和Sn颗粒后超导FeSe0.5Te0.5材料性能的增强。通过固相反应法制备了一系列添加Pb和Sn的FeSe0.5Te0.5（FeSe0.5Te0.5 + xPb + ySn；x = y = 0-0.1）块材，并通过多种测量手段进行了表征。极少量的Sn和Pb添加使纯FeSe0.5Te0.5的转变温度（Tconset）提高了1 K，使超导转变变得更尖锐，并改善了正常态的金属性质，而较多的金属添加则通过展宽超导转变降低了Tconset。微观结构分析和输运研究表明，在x=y>0.02时，Pb和Sn的添加增强了杂质相，降低了晶粒间的耦合，并抑制了超导渗流，导致转变展宽。含有2wt%共金属添加的FeSe0.5Te0.5样品表现出最佳性能，其临界电流密度Jc和钉扎力Fp最高，这可能归因于提供了有效的磁通钉扎中心。我们的研究表明，添加相对少量的Pb和Sn能有效增强超导性能，同时改善晶粒间连接以及更好的相均匀性。
英文摘要：
The enhanced performance of superconducting FeSe0.5Te0.5 materials with added microsized Pb and Sn particles is presented. A series of Pb and Sn added FeSe0.5Te0.5 (FeSe0.5Te0.5 + xPb + ySn; x = y = 0-0.1) bulks are fabricated by solid-state reaction method and characterized through various measurements. A very small amount of Sn and Pb additions enhance the transition temperature (Tconset) of pure FeSe0.5Te0.5 by 1 K, sharpening the superconducting transition and improving the metallic nature in the normal state, whereas larger metal additions reduce Tconset by broadening the superconducting transition. Microstructural analysis and transport studies suggest that at x=y>0.02, Pb and Sn additions enhance the impurity phases, reduce the coupling between grains, and suppress the superconducting percolation, leading to a broad transition. FeSe0.5Te0.5 samples with 2wt% of cometal additions show the best performance with their critical current density, Jc, and the pinning force, Fp, which might be attributable to providing effective flux pinning centres. Our study shows that the inclusion of a relatively small amount of Pb and Sn works effectively for the enhancement of superconducting properties with an improvement of intergrain connections as well as better phase uniformity.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
