تقرير
Approaching the ultimate superconducting properties of (Ba,K)Fe2As2 by naturally formed low-angle grain boundary networks
| العنوان: | Approaching the ultimate superconducting properties of (Ba,K)Fe2As2 by naturally formed low-angle grain boundary networks |
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| المؤلفون: | Iida, Kazumasa, Qin, Dongyi, Tarantini, Chiara, Hatano, Takafumi, Wang, Chao, Guo, Zimeng, Gao, Hongy, Saito, Hikaru, Hata, Satoshi, Naito, Michio, Yamamoto, Akiyasu |
| المصدر: | NPG Asia Materials, 13, 68 (2021) |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | The most effective way to enhance the dissipation-free supercurrent in presence of magnetic field for type II superconductors is the introduction of defects that acts as artificial pinning centres (APCs) for the vortices. For instance, the in-field critical current density of doped BaFe2As2 (Ba122), one of the most technologically important Fe-based superconductors, has been improved over the last decade by APCs created by ion-irradiation. The technique of ion-irradiation has been commonly implemented to determine the ultimate superconducting properties. However, this method is rather complicated and expensive. Here, we report on a surprisingly high critical current density and strong pinning efficiency close to the crystallographic c-axis for a K-doped Ba122 epitaxial thin film without APCs, achieving performance comparable to ion-irradiated K-doped Ba122 single crystals. Microstructural analysis reveals that the film is composed of columnar grains having width around 30-60 nm. The grains are rotated around the b- (or a-) axis by 1.5 degree and around the c-axis by -1 degree, resulting in the formation of low-angle grain boundary networks. This study demonstrates that the upper limit of in-field properties reached in ion-irradiated K-doped Ba122 is achievable by grain boundary engineering, which is a simple and industrially scalable manner. Comment: Main text with Supplement Material |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s41427-021-00337-5 |
| URL الوصول: | http://arxiv.org/abs/2110.15577 |
| رقم الأكسشن: | edsarx.2110.15577 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s41427-021-00337-5 |
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