000022699 001__ 22699 000022699 005__ 20180210122607.0 000022699 0247_ $$2DOI$$a10.1063/1.4745024 000022699 0247_ $$2WOS$$aWOS:000308335400117 000022699 0247_ $$2Handle$$a2128/7575 000022699 037__ $$aPreJuSER-22699 000022699 041__ $$aeng 000022699 082__ $$a530 000022699 084__ $$2WoS$$aPhysics, Applied 000022699 1001_ $$0P:(DE-Juel1)VDB103407$$aGünel, H.Y.$$b0$$uFZJ 000022699 245__ $$aSupercurrent in Nb/InAs-nanowire/Nb Josephson junctions 000022699 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2012 000022699 300__ $$a034316 000022699 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article 000022699 3367_ $$2DataCite$$aOutput Types/Journal article 000022699 3367_ $$00$$2EndNote$$aJournal Article 000022699 3367_ $$2BibTeX$$aARTICLE 000022699 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000022699 3367_ $$2DRIVER$$aarticle 000022699 440_0 $$03051$$aJournal of Applied Physics$$v112$$x0021-8979 000022699 500__ $$3POF3_Assignment on 2016-02-29 000022699 500__ $$aThe authors are grateful to H. Kertz for assistance during the measurements and S. Trellenkamp for electron beam writing. H.Y.G. thanks The Scientific and Technological Research Council of Turkey (TUBITAK) foundation. I.E.B. acknowledges the Russian Foundation for Basic Research, Project No. RFBR 09-02-01499 for financial support. 000022699 520__ $$aWe report on the fabrication and measurements of planar mesoscopic Josephson junctions formed by InAs nanowires coupled to superconducting Nb terminals. The use of Si-doped InAs-nanowires with different bulk carrier concentrations allowed to tune the properties of the junctions. We have studied the junction characteristics as a function of temperature, gate voltage, and magnetic field. For junctions with high doping concentrations in the nanowire, Josephson supercurrent values up to 100 nA are found. Owing to the use of Nb as superconductor, the Josephson coupling persists at temperatures up to 4 K. In all junctions, the critical current monotonously decreased with the magnetic field, which can be explained by a recently developed theoretical model for the proximity effect in ultra-small Josephson junctions. For the low-doped Josephson junctions, a control of the critical current by varying the gate voltage has been demonstrated. We have studied conductance fluctuations in nanowires coupled to superconducting and normal metal terminals. The conductance fluctuation amplitude is found to be about 6 times larger in superconducting contacted nanowires. The enhancement of the conductance fluctuations is attributed to phase-coherent Andreev reflection as well as to the large number of phase-coherent channels due to the large superconducting gap of the Nb electrodes. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4745024] 000022699 536__ $$0G:(DE-Juel1)FUEK412$$2G:(DE-HGF)$$aGrundlagen für zukünftige Informationstechnologien$$cP42$$x0 000022699 588__ $$aDataset connected to Web of Science 000022699 650_7 $$2WoSType$$aJ 000022699 7001_ $$0P:(DE-HGF)0$$aBatov, I.E.$$b1 000022699 7001_ $$0P:(DE-HGF)0$$aHardtdegen, H.$$b2 000022699 7001_ $$0P:(DE-HGF)0$$aSladek, K.$$b3 000022699 7001_ $$0P:(DE-Juel1)VDB97315$$aWinden, A.$$b4$$uFZJ 000022699 7001_ $$0P:(DE-Juel1)128645$$aWeis, K.$$b5$$uFZJ 000022699 7001_ $$0P:(DE-Juel1)128715$$aPanaitov, G.$$b6$$uFZJ 000022699 7001_ $$0P:(DE-Juel1)125588$$aGrützmacher, D.$$b7$$uFZJ 000022699 7001_ $$0P:(DE-Juel1)128634$$aSchäpers, Th.$$b8$$uFZJ 000022699 773__ $$0PERI:(DE-600)1476463-5$$a10.1063/1.4745024$$gVol. 112, p. 034316$$p034316$$q112<034316$$tJournal of applied physics$$v112$$x0021-8979$$y2012 000022699 8567_ $$uhttp://dx.doi.org/10.1063/1.4745024 000022699 8564_ $$uhttps://juser.fz-juelich.de/record/22699/files/FZJ-22699.pdf$$yPublished under German "Allianz" Licensing conditions on 2012-08-10. 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