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@ARTICLE{Gnel:22699,
      author       = {Günel, H.Y. and Batov, I.E. and Hardtdegen, H. and Sladek,
                      K. and Winden, A. and Weis, K. and Panaitov, G. and
                      Grützmacher, D. and Schäpers, Th.},
      title        = {{S}upercurrent in {N}b/{I}n{A}s-nanowire/{N}b {J}osephson
                      junctions},
      journal      = {Journal of applied physics},
      volume       = {112},
      issn         = {0021-8979},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-22699},
      pages        = {034316},
      year         = {2012},
      note         = {The 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.},
      abstract     = {We 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]},
      keywords     = {J (WoSType)},
      cin          = {PGI-9 / JARA-FIT / PGI-8},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-9-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)PGI-8-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Physics, Applied},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000308335400117},
      doi          = {10.1063/1.4745024},
      url          = {https://juser.fz-juelich.de/record/22699},
}