Enhancement and angular dependence of transport critical current density in pulsed laser deposited YBa2Cu3O7−x+BaSnO3 films in applied magnetic fields
Enhancement and angular dependence of transport critical current density in pulsed laser deposited YBa2Cu3O7−x+BaSnO3 films in applied magnetic fields
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DOI：
10.1063/1.2783783
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发表时间：
2007-09
影响因子：
3.2
通讯作者：
C. Varanasi;J. Burke;L. Brunke;Haiyan Wang;M. Sumption;P. Barnes
中科院分区：
文献类型：
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作者：
C. Varanasi;J. Burke;L. Brunke;Haiyan Wang;M. Sumption;P. Barnes
采用脉冲激光烧蚀由YBCO和BSO双相区制成的特殊靶材，制备了含有BaSnO 3（BSO）纳米颗粒的YBa 2Cu 3 O 7 −x（YBCO）薄膜。测量了这些YBCO+BSO薄膜在外加磁场中的输运临界电流密度（Jct）以及Jct随外加磁场取向的变化关系。据观察，在YBCO+BSO薄膜，Jct（H-12 c取向）大大增加相比，常规的YBCO薄膜，是1.3倍，高于Jct在H-12 ab取向。YBCO+BSO薄膜的横截面透射电子显微镜图像显示存在高密度（3.5× 1011 cm −2）的纳米颗粒（尺寸约为10 nm）和纳米柱，这些纳米柱延伸到整个薄膜的厚度，具有高密度的位错和堆垛层错（1000μm−2）。根据所观察到的微观结构细节，讨论了在H_xc和H_xab取向上Jct增强的观察结果。
YBa2Cu3O7−x (YBCO) films with nanoparticles of BaSnO3 (BSO) were processed using pulsed laser ablation of a special target made with dual phase sectors of YBCO and BSO. Transport critical current density (Jct) of these YBCO+BSO films in applied magnetic fields and angular dependence of Jct on the applied field orientation was measured. It was observed that in the YBCO+BSO films, the Jct (H‖c orientation) increased considerably as compared to regular YBCO films and was 1.3 times higher than Jct in H‖ab orientation. Cross-sectional transmission electron microscopy images on YBCO+BSO films showed the presence of high density (3.5×1011cm−2) of nanoparticles (∼10nm size) and nanocolumns that extended throughout the thickness of the films with high density of dislocations and stacking faults (1000μm−2). The observed results of enhancements in Jct in H‖c and Jct in H‖ab orientations were discussed in the light of the observed microstructural details.