مرکز منطقه ای اطلاع رساني علوم و فناوري - Magnetically Defined <inline-formula> <img src="/images/tex/19634.gif" alt="B_{\\rm irr}"> </inline-formula> and <inline-formula> <img src="/images/tex/25541.gif" alt="B_{{\\rm c}2}"> </inline-formula> in <inline-formula> <img src="/images/tex/24766.gif"

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 :

Issue :

fYear :

2015

fDate :

Jun-15

Firstpage :

Lastpage :

Abstract :

The effect of lattice mismatch between the film and the substrate on magnetically obtained irreversibility field B_irr and upper critical field B_c2 is investigated in BaCeO₃ (BCO)-doped YBa₂Cu₃O_6+x (YBCO) thin films prepared by pulsed laser deposition on SrTiO₃ (STO), SrLaAlO₄ (SLAO), MgO, and (67%)Pb(Mg_1/3Nb_2/3)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 J_c 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 YBa₂Cu₃O_6+x thin films; MgO; MgO substrates; PMN-PT substrates; PMN-PbTiO₃; Pb(Mg_0.33Nb_0.67)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.ricest.ac.ir/dl/search/defaultta.aspx?DTC=49&DC=56416