Zhang Yue, Liu Wenhao, Zhu Xiyu, Zhao Haonan, Hu Zheng, He Chengping, Wen Hai-Hu
Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
Sci Adv. 2018 Sep 28;4(9):eaau0192. doi: 10.1126/sciadv.aau0192. eCollection 2018 Sep.
One of the key factors that limit the high-power applications for a type II superconductor is the irreversibility line (), which reflects the very boundary of resistive dissipation in the phase diagram of magnetic field versus temperature. In cuprate family, the Y-, Bi-, Hg-, and Tl-based systems have superconducting transition temperatures exceeding the liquid nitrogen boiling temperature (~77 K). However, the toxic elements Hg and Tl in the latter two systems strongly constrain the applications. The best perspective so far is relying on the YBaCuO ( ≈ 90 K) system, which is nontoxic and has a relatively high irreversibility magnetic field. We report the study of a nontoxic superconductor (Cu,C)BaCaCuO with = 116 K. We found that the irreversibility magnetic field is extremely high, and it thus provides great potential for applications above the liquid nitrogen temperature.
限制II型超导体高功率应用的关键因素之一是不可逆线（），它反映了磁场与温度相图中电阻耗散的边界。在铜酸盐家族中，基于钇、铋、汞和铊的体系具有超过液氮沸点温度（约77K）的超导转变温度。然而，后两种体系中的有毒元素汞和铊严重限制了其应用。目前最有前景的是依赖于YBaCuO（≈90K）体系，它无毒且具有相对较高的不可逆磁场。我们报道了对一种无毒超导体（Cu,C）BaCaCuO的研究，其 = 116K。我们发现其不可逆磁场极高，因此在液氮温度以上提供了巨大的应用潜力。
