• DocumentCode
    56416
  • Title

    Magnetically Defined B_{\\rm irr} and B_{{\\rm c}2} in

  • Author

    Huhtinen, H. ; Palonen, H. ; Malmivirta, M. ; Jha, R. ; Awana, V.P.S. ; Paturi, P.

  • Author_Institution
    Dept. of Phys. & Astron., Univ. of Turku, Turku, Finland
  • Volume
    25
  • Issue
    3
  • fYear
    2015
  • fDate
    Jun-15
  • Firstpage
    1
  • Lastpage
    5
  • Abstract
    The effect of lattice mismatch between the film and the substrate on magnetically obtained irreversibility field Birr and upper critical field Bc2 is investigated in BaCeO3 (BCO)-doped YBa2Cu3O6+x (YBCO) thin films prepared by pulsed laser deposition on SrTiO3 (STO), SrLaAlO4 (SLAO), MgO, and (67%)Pb(Mg1/3Nb2/3)O3-(33%)PbTiO3 (PMN-PT) substrates. BCO has been observed to form epitaxially grown, nonelongated, and randomly distributed particles within the whole concentration range of 0-10 wt.%. Therefore, the optimal concentration of 4 wt.% BCO is selected, where the highest Jc in the high applied magnetic field range can be observed. The observed flux pinning performance is connected to the structural properties of the films, where substrate-induced uniform strain; crystallographical defects such as dislocations, vacancies, and BCO-nanodot-induced microstrain; low-angle grain boundaries; and YBCO lattice ordering, in general, have substantially different roles at different crystallographical directions.
  • Keywords
    barium compounds; dislocations; epitaxial growth; flux pinning; grain boundaries; high-temperature superconductors; internal stresses; nanostructured materials; pulsed laser deposition; superconducting critical field; superconducting epitaxial layers; tensile strength; vacancies (crystal); yttrium compounds; BCO-nanodot-induced microstrain; BaCeO3-doped YBa2Cu3O6+x thin films; MgO; MgO substrates; PMN-PT substrates; PMN-PbTiO3; Pb(Mg0.33Nb0.67)O3-PbTiO3 substrates; SrLaAlO4; SrLaAlO4 substrates; SrTiO3; SrTiO3 substrates; YBCO lattice ordering; YBCO:BaCeO3; compressive strain; crystallographical defects; crystallographical directions; dislocations; epitaxial growth; flux pinning; high applied magnetic field; lattice mismatch effect; low-angle grain boundaries; magnetically obtained irreversibility field; nonelongation; optimal concentration; pulsed laser deposition; randomly distributed particles; structural properties; substrate-induced uniform strain; tensile strain; upper critical field; vacancies; Epitaxial growth; Lattices; Strain; Substrates; Superconducting epitaxial layers; Superconducting magnets; Yttrium barium copper oxide; Flux pinning; YBCO; flux pinning; irreversibility field; lattice mismatch; microstrain; uniform strain; upper critical field;
  • fLanguage
    English
  • Journal_Title
    Applied Superconductivity, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    1051-8223
  • Type

    jour

  • DOI
    10.1109/TASC.2014.2374792
  • Filename
    6966722
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=56416