Promotion of Epitaxial Growth and Enhanced Jc by Coaddition of Br and Metals (Zr, Sn, Hf) to the Fluorine-Free MOD Processed YBCO Films
Promotion of Epitaxial Growth and Enhanced Jc by Coaddition of Br and Metals (Zr, Sn, Hf) to the Fluorine-Free MOD Processed YBCO Films
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DOI：
10.1109/tasc.2019.2898552
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发表时间：
2019-02
影响因子：
1.8
通讯作者：
T. Motoki;Shuhei Ikeda;S. Gondo;Shin‐ichi Nakamura;G. Honda;T. Nagaishi;T. Doi;J. Shimoyama
中科院分区：
文献类型：
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作者：
T. Motoki;Shuhei Ikeda;S. Gondo;Shin‐ichi Nakamura;G. Honda;T. Nagaishi;T. Doi;J. Shimoyama
对采用无氟金属有机分解法制备的YBCO薄膜进行了Br和金属(M)共加成的试验，其中M = Zr, Sn, Hf。结果表明，br的加入促进了YBCO晶体的双轴排列，从而在薄膜中形成了织构化的Ba2Cu3O4Br2氧溴化物。虽然由于M的加入导致结晶度严重下降，并没有改善Jc，但（Br， M）-共添加通过抑制随机晶体生长，在很大程度上提高了助焊剂钉接性能。添加（Br， M）的YBCO薄膜在4.8 T、40 K下的钉住力密度达到了~ 62 GN/m3。这个值比无添加剂的YBCO薄膜大三倍以上。
Coaddition of Br and metals (M), where M = Zr, Sn, Hf, was attempted for YBCO films prepared by the fluorine-free metal-organic decomposition method. It was revealed that Br-addition, which subsequently forms textured Ba2Cu3O4Br2 oxybromides in the film, promotes the biaxial alignment of the YBCO crystals. Although M-addition did not improve Jc owing to the serious degradation of crystallinity, (Br, M)-coaddition was found to largely enhance flux pinning properties by the suppression of the random crystal growth. The pinning force density at 40 K in 4.8 T reached ∼62 GN/m3 for (Br, M)-coadded YBCO films. This value is more than three times large compared to that of additive-free YBCO films.