Achieving High Jc in High Fields in Multilayer BZO/YBCO Thick Films

IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Judy Wu;Victor Ogunjimi;Mary Ann Sebastian;Mohan Panth;Jianan Shen;Matteo Moceri;Aafiya Aafiya;Timothy Haugan;Haiyan Wang
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Abstract

Improved pinning efficiency of c-axis-aligned BaZrO 3 nanorods (BZO-NRs) in BZO/YBa 2 Cu 3 O 7 nanocomposite thin films was obtained recently using a multilayer (ML) approach, in which diffusion of Ca ions from two thin (Ca 0.3 Y 0.7 )BCO spacers (10 nm in thickness) sandwiched with three BZO/YBa 2 Cu 3 O 7 layers. The subsequent Ca (30% larger)/Cu substitution at the Cu-O planes of YBCO was found energetically preferable by inducing c-axis elongation of the YBa 2 Cu 3 O 7 lattice near the BZO-NRs/YBa 2 Cu 3 O 7 interface to enable a coherent interface via reducing the BZO/YBCO lattice mismatch from originally 7.7% to 1.4%, leading to significantly enhanced J c ( B ) and F p in thin ML films of 150 nm in thickness. This work investigates whether improved pinning could be achievable in thicker BZO-NRs/YBa 2 Cu 3 O 7 ML films with the thickness increased to 1000 nm. Interestingly, similar pinning enhancement has been observed in thick BZO-NRs/YBa 2 Cu 3 O 7 ML films across a wide temperature range of 20–80 K. In particular, the thicker BZO-NRs/YBa 2 Cu 3 O 7 ML films outperform their thinner counterparts in both higher value and less anisotropy of J c ( B ). At 1000 nm thickness, I c (30 K, 9T) reaches up to ∼680 A/cm-width with a variation of ∼85% over the entire angular range of B field orientations. This result illustrates the critical role of Ca diffusion at the BZO-NRs/YBCO interface for improving pinning efficiency of BZO-NRs in a wide range of temperatures and B fields.
多层BZO/YBCO厚膜在高场中实现高Jc
采用多层(ML)方法,在BZO/YBa2Cu3O7纳米复合薄膜中,通过两层(Ca0.3Y0.7)薄BCO间隔层(厚度为10 nm)夹在三层BZO/YBa2Cu3O7中,获得了c轴排列的BaZrO3纳米棒(BZO- nrs)的钉钉效率提高。通过诱导BZO- nrs /YBa2Cu3O7界面附近的YBa2Cu3O7晶格的c轴伸长,使BZO/YBCO晶格失配从原来的7.7%降低到1.4%,从而使150 nm厚度的ML薄膜中的Jc (B)和Fp显著增强,YBCO Cu- o平面上的Ca(30%以上)/Cu取代在能量上更有优势。本文研究了当BZO-NRs/YBa2Cu3O7 ML薄膜厚度增加到1000 nm时,是否可以实现更好的钉住。有趣的是,在20-80 K的宽温度范围内,在BZO-NRs/YBa2Cu3O7 ML厚膜中也观察到类似的钉钉增强。特别是,较厚的BZO-NRs/YBa2Cu3O7 ML薄膜在更高的值和更少的Jc (B)各向异性方面优于较薄的薄膜。在1000 nm厚度下,Ic (30 K, 9T)达到高达~ 680 A/cm-宽度,在B场取向的整个角度范围内变化约85%。这一结果说明了Ca在BZO-NRs/YBCO界面上的扩散对于提高BZO-NRs在大范围温度和B场下的钉钉效率的关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IEEE Transactions on Applied Superconductivity
IEEE Transactions on Applied Superconductivity 工程技术-工程:电子与电气
CiteScore
3.50
自引率
33.30%
发文量
650
审稿时长
2.3 months
期刊介绍: IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.
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