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Proximity‐Effect‐Induced Superconductivity in Nb/Sb2Te3‐Nanoribbon/Nb Junctions
Annalen Der Physik ( IF 2.4 ) Pub Date : 2020-07-09 , DOI: 10.1002/andp.202000273
Jinzhong Zhang 1, 2, 3 , Abdur Rehman Jalil 1, 2 , Pok‐Lam Tse 4 , Jonas Kölzer 1, 2 , Daniel Rosenbach 1, 2 , Helen Valencia 5 , Martina Luysberg 5 , Martin Mikulics 1, 2 , Gregory Panaitov 6 , Detlev Grützmacher 1, 2 , Zhigao Hu 3 , Jia Grace Lu 4 , Thomas Schäpers 1, 2
Affiliation  

Nanohybrid superconducting junctions using antimony telluride (Sb2Te3) topological insulator nanoribbons and Nb superconducting electrodes are fabricated using electron beam lithography and magnetron sputtering. The effects of bias current, temperature, and magnetic field on the transport properties of the junctions in a four‐terminal measurement configuration are investigated. Two features are observed. First, the formation of a Josephson weak‐link junction. The junction is formed by proximity‐induced areas in the nanoribbon right underneath the inner Nb electrodes which are connected by the few tens of nanometers short Sb2Te3 bridge. At 0.5 K a critical current of 0.15 µA is observed. The decrease of the supercurrent with temperature is explained in the framework of a diffusive junction. Furthermore, the Josephson supercurrent is found to decrease monotonously with the magnetic field indicating that the structure is in the small‐junction limit. As a second feature, a transition is also observed in the differential resistance at larger bias currents and larger magnetic fields, which is attributed to the suppression of the proximity‐induced superconductive state in the nanoribbon area underneath the Nb electrodes.

中文翻译:

Nb / Sb2Te3-纳米带/ Nb结中的接近效应诱导的超导

利用电子束光刻和磁控溅射技术制备了使用碲化锑(Sb 2 Te 3)拓扑绝缘体纳米带和Nb超导电极的纳米杂化超导结。研究了偏置电流,温度和磁场对四端测量配置中结的传输性质的影响。观察到两个特征。首先,约瑟夫森弱链接结的形成。结是由内部Nb电极正下方的纳米带中的邻近感应区域形成的,这些区域由几十纳米的短Sb 2 Te 3连接桥。在0.5 K时,观察到的临界电流为0.15 µA。在扩散结的框架中解释了超电流随温度的降低。此外,发现约瑟夫森超电流随磁场单调减少,表明该结构处于小结极限。第二个特征是,在较大的偏置电流和较大的磁场下,在差动电阻中也观察到过渡,这归因于Nb电极下方纳米带区域中邻近感应超导态的抑制。
更新日期:2020-07-09
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