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@ARTICLE{Celentano:877980,
      author       = {Celentano, G. and Rizzo, F. and Augieri, A. and Mancini, A.
                      and Pinto, V. and Rufoloni, A. and Vannozzi, A. and
                      MacManus-Driscoll, J. L. and Feighan, J. and Kursumovic, A.
                      and Meledin, A. and Mayer, J. and Van Tendeloo, G.},
      title        = {{YB}a 2 {C}u 3 {O} 7−x films with {B}a 2
                      {Y}({N}b,{T}a){O} 6 nanoinclusions for high-field
                      applications},
      journal      = {Superconductor science and technology},
      volume       = {33},
      number       = {4},
      issn         = {1361-6668},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2020-02554},
      pages        = {044010 -},
      year         = {2020},
      abstract     = {The structural and transport properties of YBa2Cu3O7−x
                      films grown by pulsed laser deposition with mixed 2.5
                      $mol\%$ Ba2YTaO6 (BYTO) and 2.5 $mol\%$ Ba2YNbO6 (BYNO)
                      double-perovskite secondary phases are investigated in an
                      extended film growth rate, R = 0.02–1.8 nm s−1. The
                      effect of R on the film microstructure analyzed by TEM
                      techniques shows an evolution from sparse and straight to
                      denser, thinner and splayed continuous columns, with mixed
                      BYNO + BYTO (BYNTO) composition, as R increases from 0.02 nm
                      s−1 to 1.2 nm s−1. This microstructure results in very
                      efficient flux pinning at 77 K, leading to a remarkable
                      improvement in the critical current density (Jc) behaviour,
                      with the maximum pinning force density Fp(Max) = 13.5 GN
                      m−3 and the irreversibility field in excess of 11 T. In
                      this range, the magnetic field values at which the Fp is
                      maximized varies from 1 T to 5 T, being related to the BYNTO
                      columnar density. The film deposited when R = 0.3 nm s−1
                      exhibits the best performances over the whole temperature
                      and magnetic field ranges, achieving Fp(Max) = 900 GN m−3
                      at 10 K and 12 T. At higher rates, R > 1.2 nm s−1, BYNTO
                      columns show a meandering nature and are prone to form short
                      nanorods. In addition, in the YBCO film matrix a more
                      disordered structure with a high density of short stacking
                      faults is observed. From the analysis of the Fp(H, T) curves
                      it emerges that in films deposited at the high R limit, the
                      vortex pinning is no longer dominated by BYNTO columnar
                      defects, but by a new mechanism showing the typical
                      temperature scaling law. Even though this microstructure
                      produces a limited improvement at 77 K, it exhibits a strong
                      Jc improvement at lower temperature with Fp = 700 GN m−3
                      at 10 K, 12 T and 900 GN m−3 at 4.2 K, 18 T.},
      cin          = {ER-C-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ER-C-2-20170209},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)
                      / ESTEEM3 - Enabling Science and Technology through European
                      Electron Microscopy (823717)},
      pid          = {G:(DE-HGF)POF3-143 / G:(EU-Grant)823717},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000525650500001},
      doi          = {10.1088/1361-6668/ab6ee5},
      url          = {https://juser.fz-juelich.de/record/877980},
}