Hybrid artificial pinning centers of elongated-nanorods and segmented-nanorods in YBa2Cu3O7films

Tomoya Horide, Nobuhiro Sakamoto, Ataru Ichinose, Koji Otsubo, Takanori Kitamura, Kaname Matsumoto

doi:10.1088/0953-2048/29/10/105010

To control the anisotropy of critical current density (J c), hybrid artificial pinning centers (APCs) of elongated-nanorods and segmented-nanorods were incorporated into YBa2Cu3O7 films. The elongated-nanorods and segmented-nanorods were formed by fabricating multilayer films using YBa2Cu3O7+BaSnO3 targets with a different BaSnO3 content. According to the elastic calculation, the BaSnO3-free YBa2Cu3O7 regions between BaSnO3 segmented-nanorods were highly strained, resulting in their alignment along the c-axis. Pinning of the vortex kinks and straight vortices by the nanorod ends improved J c in a wide range around B//ab. The angular dependence of J c systematically varied with the multilayer structure of layer thickness and BSO content. J c depended on the layer thickness even with keeping the constant average BSO content, showing that the BaSnO3 distribution, as well as the average BaSnO3 content, affected the J c. The hybrid pinning effect of elongated-nanorods and nanorod ends improved the J c anisotropy although the effect was not so large in the present films. The control of strain and interface is expected to lead to further improvement of J c.

Hybrid artificial pinning centers of elongated-nanorods and segmented-nanorods in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>films

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