Yamashita Aichi, Shukunami Yuta, Mizuguchi Yoshikazu
Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.
R Soc Open Sci. 2022 Mar 30;9(3):211874. doi: 10.1098/rsos.211874. eCollection 2022 Mar.
BaCuO (123, : rare earth) is one of the high-temperature superconductors with a transition temperature ( ) exceeding 90 K. Because of its high- and large critical current density ( ) under magnetic fields, 123 superconductors have been expected to play a key role in superconductivity application. To accelerate application researches on 123-based devices, further improvements of characteristics have been desired. In this study, we investigated the effects of high-entropy alloying at the site on the superconducting properties, through the measurements of local (intra-grain) ( ) by a remanent magnetization method. We found that shows a trend to be improved when four or five elements are mixed at the site, which results in high configurational entropy of mixing (Δ ). All samples exhibited an order of few MA cm which is a criterion for practical application and the highest resulted in a value of around 7.0 MA cm at = 2.0 K. Because high-entropy alloying can improve of 123 superconductors, our entropy-engineering strategy introduced here would be useful for the development of 123 superconducting materials available under high magnetic fields.
钇钡铜氧（123，：稀土）是转变温度（）超过90K的高温超导材料之一。由于其在磁场下具有高临界温度和大临界电流密度（），123超导体有望在超导应用中发挥关键作用。为了加速基于123的器件的应用研究，人们期望进一步改善其特性。在本研究中，我们通过剩磁法测量局部（晶粒内）临界电流密度（），研究了在位点进行高熵合金化对超导性能的影响。我们发现，在位点混合四种或五种元素时，临界电流密度呈现出改善的趋势，这导致了高混合组态熵（Δ）。所有样品都表现出几MA/cm的量级，这是实际应用的一个标准，在 = 2.0K时，最高临界电流密度达到约7.0MA/cm。由于高熵合金化可以改善123超导体的临界电流密度，我们在此引入的熵工程策略将有助于开发在高磁场下可用的123超导材料。
