Zhang Gufei, Samuely Tomas, Iwahara Naoya, Kačmarčík Jozef, Wang Changan, May Paul W, Jochum Johanna K, Onufriienko Oleksandr, Szabó Pavol, Zhou Shengqiang, Samuely Peter, Moshchalkov Victor V, Chibotaru Liviu F, Rubahn Horst-Günter
NanoSYD, Mads Clausen Institute and DIAS Danish Institute for Advanced Study, University of Southern Denmark, Alsion 2, DK-6400 Sonderborg, Denmark.
Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences & Faculty of Science, P. J. Safarik University, Kosice, Slovakia.
Sci Adv. 2020 May 15;6(20):eaaz2536. doi: 10.1126/sciadv.aaz2536. eCollection 2020 May.
The combination of different exotic properties in materials paves the way for the emergence of their new potential applications. An example is the recently found coexistence of the mutually antagonistic ferromagnetism and superconductivity in hydrogenated boron-doped diamond, which promises to be an attractive system with which to explore unconventional physics. Here, we show the emergence of Yu-Shiba-Rusinov (YSR) bands with a spatial extent of tens of nanometers in ferromagnetic superconducting diamond using scanning tunneling spectroscopy. We demonstrate theoretically how a two-dimensional (2D) spin lattice at the surface of a three-dimensional (3D) superconductor gives rise to the YSR bands and how their density-of-states profile correlates with the spin lattice structure. The established strategy to realize new forms of the coexistence of ferromagnetism and superconductivity opens a way to engineer the unusual electronic states and also to design better-performing superconducting devices.
材料中不同奇异特性的结合为其新的潜在应用的出现铺平了道路。一个例子是最近在氢化硼掺杂金刚石中发现的相互拮抗的铁磁性和超导性的共存，这有望成为一个探索非常规物理的有吸引力的系统。在这里，我们利用扫描隧道光谱法展示了在铁磁超导金刚石中出现的空间范围为几十纳米的汤川-芝-鲁西诺夫（YSR）能带。我们从理论上证明了三维（3D）超导体表面的二维（2D）自旋晶格如何产生YSR能带，以及它们的态密度分布如何与自旋晶格结构相关。实现铁磁性和超导性共存新形式的既定策略为设计异常电子态以及设计性能更好的超导器件开辟了一条道路。
