Spatially Resolved Characterization of the Local Superconducting Properties of Compositional Gradient REBCO Films

IF 1.7 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity Pub Date : 2025-02-27 DOI:10.1109/TASC.2025.3546597

Zeyu Wu;Kohei Higashikawa;Albert Queraltó;Emma Ghiara;Cornelia Pop;Kapil Gupta;Xavier Obradors;Teresa Puig;Takanobu Kiss

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Abstract

We have succeeded in developing a high-resolution and high-throughput measurement method for local sheet current density (J_s) and critical temperature (T_c) in a thin film sample prepared by Transient Liquid-Assisted Growth using Chemical Solution Deposition (TLAG-CSD), based on magnetic microscopy. Drop-on-demand inkjet printing (IJP) has been adopted to design and fabricate a combinatorial sample with a one-dimensional compositional gradient of Rare Earth (RE) elements within the REBa₂Cu₃O_7-_δ (REBCO, RE = Y_ϵGd_1-_ϵ) crystal. The quality of the epitaxial REBCO film has been assessed in several sample locations by means of EDX, XRD and SEM characterization techniques to unravel the Rare Earth influence on the growth. However, the relationship with superconducting properties is not yet fully understood. In this study, we have developed a high-resolution and high-throughput measurement method for local J_s at low temperature and in-field conditions, as well as T_c in a film sample by low-temperature in-field scanning Hall probe microscopy. Corresponding J_s distributions are obtained at 5 K and up to 4.5 T, which J_s is greatly influenced by the composition because the Gd rich compositions exhibit polycrystallinity and ab-oriented grain. The optimum compositions for the highest J_s are close to the 50% of Y and Gd composition at 4.5 T and at self-field. Furthermore, the temperature dependence of J_s distribution is studied up to 88.0 K at self-field and the spatial T_c distribution is derived to study the relationship between T_c and compositions. T_c dependence with the Rare Earth composition is similarly to that of J_s.

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组分梯度REBCO薄膜局部超导特性的空间分辨表征

我们已经成功地开发了一种高分辨率和高通量的测量方法，用于在基于磁显微镜的瞬态液体辅助生长化学溶液沉积（TLAG-CSD）制备的薄膜样品中的局部薄片电流密度（Js）和临界温度（Tc）。采用滴按需喷墨打印技术（IJP）设计并制备了REBa2Cu3O7-δ （REBCO, RE = YϵGd1- ε）晶体内具有稀土元素一维组成梯度的组合样品。利用EDX、XRD和SEM表征技术，在不同的样品位置对REBCO外延薄膜的质量进行了评价，以揭示稀土对薄膜生长的影响。然而，与超导性质的关系尚未完全了解。在这项研究中，我们开发了一种高分辨率和高通量的测量方法，用于低温和场内条件下的局部j，以及通过低温场内扫描霍尔探针显微镜测量薄膜样品中的Tc。在5 K和高达4.5 T时得到了相应的Js分布，由于富Gd的成分表现出多结晶性和ab取向晶粒，Js受成分的影响很大。在4.5 T和自场下，最高j的最佳组成接近Y和Gd组成的50%。在自场温度高达88.0 K时，研究了Js分布的温度依赖性，并推导了Tc的空间分布，研究了Tc与组分之间的关系。Tc与稀土组成的关系类似于Js。

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来源期刊

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.