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@ARTICLE{Khaydukov:878679,
      author       = {Khaydukov, Yury and Pütter, Sabine and Guasco, Laura and
                      Morari, Roman and Kim, Gideok and Keller, Thomas and
                      Sidorenko, Anatolie and Keimer, Bernhard},
      title        = {{P}roximity effect in [{N}b(1.5 nm)/{F}e( x )]$_{10}$
                      /{N}b(50 nm) superconductor/ferromagnet heterostructures},
      journal      = {Beilstein journal of nanotechnology},
      volume       = {11},
      issn         = {2190-4286},
      address      = {Frankfurt, M.},
      publisher    = {Beilstein-Institut zur Förderung der Chemischen
                      Wissenschaften},
      reportid     = {FZJ-2020-02997},
      pages        = {1254 - 1263},
      year         = {2020},
      abstract     = {We have investigated the structural, magnetic and
                      superconduction properties of [Nb(1.5 nm)/Fe(x)]$_{10}$
                      superlattices deposited on a thick Nb(50 nm) layer. Our
                      investigation showed that the Nb(50 nm) layer grows
                      epitaxially at 800 °C on the Al2O3(1$\bar{1}$02) substrate.
                      Samples grown at this condition possess a high residual
                      resistivity ratio of 15–20. By using neutron reflectometry
                      we show that Fe/Nb superlattices with x < 4 nm form a
                      depth-modulated FeNb alloy with concentration of iron
                      varying between 60\% and 90\%. This alloy has weak
                      ferromagnetic properties. The proximity of this weak
                      ferromagnetic layer to a thick superconductor leads to an
                      intermediate phase that is characterized by a suppressed but
                      still finite resistance of structure in a temperature
                      interval of about 1 K below the superconducting transition
                      of thick Nb. By increasing the thickness of the Fe layer to
                      x = 4 nm the intermediate phase disappears. We attribute the
                      intermediate state to proximity induced non-homogeneous
                      superconductivity in the structure.},
      cin          = {JCNS-FRM-II / JCNS-2 / MLZ},
      ddc          = {620},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 524 - Controlling Collective
                      States (POF3-524) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623) / 6G15 - FRM II / MLZ
                      (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)MBE-MLZ-20151210 / EXP:(DE-MLZ)N-REX-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:32874825},
      UT           = {WOS:000567855800001},
      doi          = {10.3762/bjnano.11.109},
      url          = {https://juser.fz-juelich.de/record/878679},
}