Journal Article

FZJ-2020-02495

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Proximity-Effect-Induced Superconductivity in Nb/Sb2Te3 -Nanoribbon/Nb Junctions

Zhang, J.FZJ* ; Jalil, A. R.FZJ* ; Tse, P.-L. ; Kölzer, J.FZJ* ; Rosenbach, D.FZJ* ; Valencia, H.FZJ* ; Luysberg, M.FZJ* ; Mikulics, M.FZJ* ; Panaitov, G.FZJ* ; Grützmacher, D.FZJ* ; Hu, Z. ; Lu, J. G. ; Schäpers, T. (Corresponding author)FZJ*

2020
Barth88001 Leipzig

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Please use a persistent id in citations: http://hdl.handle.net/2128/25643  doi:10.1002/andp.202000273

Abstract: 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.

Keyword(s): Information and Communication (1st) ; Condensed Matter Physics (2nd)

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. Physik Nanoskaliger Systeme (ER-C-1)
3. Materialwissenschaft u. Werkstofftechnik (ER-C-2)
4. Bioelektronik (IBI-3)

Research Program(s):

1. 522 - Controlling Spin-Based Phenomena (POF3-522) (POF3-522)
2. DFG project 390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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