%0 Journal Article
%A Günel, H. Y.
%A Borgwardt, N.
%A Batov, I. E.
%A Hardtdegen, Hilde
%A Sladek, Kamil
%A Panaitov, Gregory
%A Grützmacher, Detlev
%A Schäpers, Thomas
%T Crossover from Josephson Effect to Single Interface Andreev Reflection in Asymmetric Superconductor/Nanowire Junctions
%J Nano letters
%V 14
%@ 1530-6992
%C Washington, DC
%I ACS Publ.
%M FZJ-2014-04975
%P 4977-4981
%D 2014
%X We report on the fabrication and characterization of symmetric nanowire-based Josephson junctions, that is, Al- and Nb-based junctions, and asymmetric junctions employing superconducting Al and Nb. In the symmetric junctions, a clear and pronounced Josephson supercurrent is observed. These samples also show clear signatures of subharmonic gap structures. At zero magnetic field, a Josephson coupling is found for theasymmetric Al/InAs-nanowire/Nb junctions as well. By applying a magnetic field above the criticalfield of Al or by raising the temperature above the critical temperature of Al the junction can be switched to an effective singleinterface superconductor/nanowire structure. In this regime, a pronounced zero-bias conductance peak due to reflectionless tunneling has been observed.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000341544500009
%$ pmid:25118624
%R 10.1021/nl501350v
%U https://juser.fz-juelich.de/record/156101