3D strain-induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach
3D strain-induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach
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DOI：
10.1126/sciadv.aav5532
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发表时间：
2019-04-01
期刊：
影响因子：
13.6
通讯作者：
MacManus-Driscoll, Judith L.
中科院分区：
文献类型：
--
作者：
Choi, Eun-Mi;Di Bernardo, Angelo;MacManus-Driscoll, Judith L.
超导体的一个长期目标是提高超导转变温度T-C。在铜酸盐中，T-C强烈依赖于面外的铜顶氧距离和面内的铜-氧距离，但很少有人注意到它们的独立调节。在这里，在简单生长、自组装、垂直排列的La2CuO4+Delta+LaCuO3纳米复合薄膜中，通过在不减小面内距离的情况下大幅增加面外距离(三维应变工程)，我们在垂直界面区域实现了高达50K的超导电性，间距接近50 nm。不需要额外的工艺来提供多余的氧气，例如通过臭氧或高压氧气退火，这通常是普通La2CuO4+Delta的情况。电影。我们的概念验证工作代表了一种全新的方法来提高铜酸盐或其他超导体的T-C。
A long-term goal for superconductors is to increase the superconducting transition temperature, T-C. In cuprates, T-C depends strongly on the out-of-plane Cu-apical oxygen distance and the in-plane Cu-O distance, but there has been little attention paid to tuning them independently. Here, in simply grown, self-assembled, vertically aligned nanocomposite thin films of La2CuO4+delta + LaCuO3, by strongly increasing out-of-plane distances without reducing in-plane distances (three-dimensional strain engineering), we achieve superconductivity up to 50 K in the vertical interface regions, spaced similar to 50 nm apart. No additional process to supply excess oxygen, e.g., by ozone or high-pressure oxygen annealing, was required, as is normally the case for plain La2CuO4+delta. films. Our proof-of-concept work represents an entirely new approach to increasing T-C in cuprates or other superconductors.