Jc improvement by double artificial pinning centers of BaSnO3 nanorods and Y2O3 nanoparticles in YBa2Cu3O7 coated conductors
Jc improvement by double artificial pinning centers of BaSnO3 nanorods and Y2O3 nanoparticles in YBa2Cu3O7 coated conductors
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DOI：
10.1088/0953-2048/26/7/075019
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发表时间：
2013-07-01
影响因子：
3.6
通讯作者：
Shiohara, Yuh
中科院分区：
文献类型：
--
作者：
Horide, Tomoya;Kawamura, Takehiro;Shiohara, Yuh
采用离子束辅助沉积技术制备了YBa2Cu3O7薄膜，研究了纳米BaSnO3和纳米Y2O3的双人工钉钉中心。在脉冲激光沉积过程中，BaSnO3和Y2O3含量发生了变化。透射电镜观察发现，薄膜中BaSnO3纳米棒和Y2O3纳米颗粒的密度发生了系统的变化。在高磁场下，YBa2Cu3O7 + BaSnO3薄膜的最大全局钉钉力（F-p,F- max）得到提高，并且由于Y2O3的加入，钉钉中心密度增加，F- p，F- max向高磁场偏移。YBa2Cu3O7 + BaSnO3 + Y2O3薄膜中临界电流密度J(c)的角依赖性通过引入Y2O3得到调整，部分YBa2Cu3O7 + BaSnO3 + Y2O3薄膜在低磁场下表现出各向同性Jc行为。在高磁场条件下，采用双人工钉钉的方法可以有效地改善纳米棒的Jc角依赖性、Jc值和F-p、F- max。
Double artificial pinning centers of BaSnO3 nanorods and Y2O3 nanoparticles were investigated in YBa2Cu3O7 films on textured substrates prepared using ion beam assisted deposition. The BaSnO3 and Y2O3 content was varied in pulsed laser deposition. Transmission electron microscopy observation revealed the systematic change in density of the BaSnO3 nanorods and the Y2O3 nanoparticles in the films. In YBa2Cu3O7 + BaSnO3 films, maximum global pinning force (F-p,F- max) was improved at high magnetic fields, and F-p,F- max was shifted to high magnetic field by the Y2O3 incorporation due to an increase in density of the pinning centers. The angular dependences of critical current density (J(c)) in the YBCO + BaSnO3 films were tuned by introducing Y2O3, and some of the YBa2Cu3O7 + BaSnO3 + Y2O3 films exhibited isotropic Jc behavior at low magnetic field. The double artificial pinning centers of BaSnO3 nanorods and Y2O3 nanoparticles are effective in improving Jc angular dependences, Jc values at high magnetic fields, and F-p,F- max.