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Improved flux‐pinning properties of REBa 2 Cu 3 O 7– z films by low‐level Co doping
Author(s) -
Wang Wentao,
Pu Minghua,
Wang Weiwei,
Lei Ming,
Cheng Cuihua,
Zhao Yong
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201026576
Subject(s) - doping , flux pinning , materials science , substrate (aquarium) , superconductivity , flux (metallurgy) , condensed matter physics , pinning force , analytical chemistry (journal) , thin film , nanotechnology , critical current , metallurgy , chemistry , optoelectronics , physics , oceanography , chromatography , geology
Biaxially textured REBa 2 Cu 3– x Co x O 7– z (RE = Gd,Y) films were prepared on (00l) LaAlO 3 substrate using self‐developed fluorine‐free chemical solution deposition (CSD) approach. The in‐field J c values are significantly improved for REBa 2 Cu 3– x Co x O 7– z films through low‐level Co doping. Co‐doped GdBa 2 Cu 3 O 7– z film shows the highest J c values at higher temperatures and fields, whereas the J c values of Co‐doped YBa 2 Cu 3 O 7– z film surpass that of other films at lower temperatures and fields. In addition, the volume pinning force densities of films with Co doping have been distinctly enhanced in the applied fields, indicating improved flux‐pinning properties. The possible reasons are discussed in detail.