Hybrid artificial pinning centers of elongated-nanorods and segmented-nanorods in YBa2Cu3O7 films. (1st September 2016)

• Record Type: Journal Article
• Authors: Horide, Tomoya; Sakamoto, Nobuhiro; Ichinose, Ataru; Otsubo, Koji; Kitamura, Takanori; Matsumoto, Kaname
• Is Part Of: Superconductor science & technology. Volume 29:Number 10(2016:Oct.)
• Publication Date: 2016-09-01
• Subjects: vortex pinning -- YBCO -- nanorod; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/29/10/105010
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: To control the anisotropy of critical current density ( J c ), hybrid artificial pinning centers (APCs) of elongated-nanorods and segmented-nanorods were incorporated into YBa2 Cu3 O7 films. The elongated-nanorods and segmented-nanorods were formed by fabricating multilayer films using YBa2 Cu3 O7 +BaSnO3 targets with a different BaSnO3 content. According to the elastic calculation, the BaSnO3 -free YBa2 Cu3 O7 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 .