文章基本信息

标题：Engineering nanocolumnar defect configurations for optimized vortex pinning in high temperature superconducting nanocomposite wires
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作者：Sung Hun Wee ; Yuri L. Zuev ; Claudia Cantoni 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2013
卷号：3
DOI：10.1038/srep02310
出版社：Springer Nature
摘要：We report microstructural design via control of BaZrO₃ (BZO) defect density in high temperature superconducting (HTS) wires based on epitaxial YBa₂Cu₃O_7-δ (YBCO) films to achieve the highest critical current density, J _c, at different fields, H . We find the occurrence of J _c( H ) cross-over between the films with 1–4 vol% BZO, indicating that optimal BZO doping is strongly field-dependent. The matching fields, B_φ, estimated by the number density of BZO nanocolumns are matched to the field ranges for which 1–4 vol% BZO-doped films exhibit the highest J _c( H ). With incorporation of BZO defects with the controlled density, we fabricate 4-μm-thick single layer, YBCO + BZO nanocomposite film having the critical current ( I _c) of ~1000 A cm⁻¹ at 77 K, self-field and the record minimum I _c, I _c(min), of 455 A cm⁻¹ at 65 K and 3 T for all field angles. This I _c(min) is the largest value ever reported from HTS films fabricated on metallic templates.