The Angular Dependence of the Critical Current of Doped Thin Films
The angular dependencies of the crucial current of $hboxBaCeO_3$ (BCO) doped $hboxYBa_2hboxCu_3hboxO_6+x $ (YBCO) skinny films grown with pulsed laser deposition (PLD) on $hboxSrTiO_3 $ (001) were systematically investigated. The BCO concentration within the YBCO matrix was varied between 0–eight wt.percent. Transmission electron microscopy confirmed that the 4percent BCO containing sample has point-like, partly agglomerated BCO particles with diameter of 2.five nm. The dopant degrades the crystal quality of YBCO but improves its in-field current carrying performance especially at low temperatures. The BCO addition affects the angular dependence of the crucial current by broadening the $BVert ab$-axis peak of YCBO but no $c$-axis peak is seen, that is contrary to $hboxBaZrO_3 $ doped films created by PLD. Though the particles are point-like, it's found that a model featuring solely isotropic pinning centers is not sufficient to describe the angular dependence of the samples where $BVert ab$-axis of YCBO.
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