通过增加RE位的混合构型熵提高REBa2Cu3O7-d的局部临界电流密度
Improvement of local critical current density of REBa2Cu3O7-d by the increase in configurational entropy of mixing at the RE site
摘要：
REBa_2Cu_3 O_（7-d）（RE_（123），RE：稀土）是一种转变温度（Tc）超过90 K的高温超导体。RE 123超导体具有高的Tc和在磁场下大的临界电流密度（Jc），有望在超导应用中发挥重要作用。为了加速RE 123基器件的应用研究，期望进一步改善Jc特性。在这项研究中，我们研究了高熵合金化在稀土网站上的超导性能的影响，通过测量本地（晶粒内）Jc（Jclocal）的reversible磁化方法。我们发现，Jclocal显示出改善的趋势时，四个或五个RE元素解决在RE网站，这导致高的混合构型熵（Δ_Smix）。由于高熵合金化可以通过改变RE位的组成和δ_Smix来提高RE_（123）超导体的J_c局部，并且该技术可以与其他技术（如引入纳米级无序）一起应用，因此本文介绍的熵工程策略将有助于开发在高磁场下可用的RE_（123）超导材料。
英文摘要：
REBa2Cu3O7-d (RE123, RE: rare earth) is one of the high-temperature superconductors with a transition temperature (Tc) exceeding 90 K. Because of its high Tc and large critical current density (Jc) under magnetic fields, RE123 superconductors have been expected to play a key role in superconductivity application. To accelerate application researches on RE123-based devices, further improvements of Jc characteristics have been desired. In this study, we investigated the effects of high-entropy alloying at the RE site on the superconducting properties, through the measurements of local (intra-grain) Jc (Jclocal) by a remanent magnetization method. We found that Jclocal shows a trend to be improved when four or five RE elements are solved at the RE site, which results in high configurational entropy of mixing (delta_Smix). Because high-entropy alloying can improve Jclocal of RE123 superconductors by modification of the RE site composition and delta_Smix, and the technique would be applicable together with other techniques, such as introduction of nanoscale disorders, our entropy-engineering strategy introduced here would be useful for development of RE123 superconducting materials available under high magnetic fields.
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