The effect of thickness and substrate tilt on the BZO splay and superconducting properties of YBa2Cu3O7 − δ films
The effect of thickness and substrate tilt on the BZO splay and superconducting properties of YBa2Cu3O7 − δ films
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DOI：
10.1088/0953-2048/23/11/115010
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发表时间：
2010-11
影响因子：
3.6
通讯作者：
R. Emergo;F. Baca;J. Wu;T. Haugan;P. Barnes
中科院分区：
文献类型：
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作者：
R. Emergo;F. Baca;J. Wu;T. Haugan;P. Barnes
在5°邻近的钛酸锶(−δ)衬底上，掺入2%的Ba2Cu3O7(YBCO)薄膜，得到了高度分散的BaZrO_3纳米棒。观察到BZO-NRS在c轴方向的展开角随着薄膜厚度的增加而增大，从0.2µm处的约10°增加到1µm处的35°-40°，而在平坦的YBCO薄膜中也观察到了同样的趋势，但在给定厚度处的展开角及其随膜厚的增加都明显减小。BZO-NRS在附近的YBCO/BZO-NR薄膜中的分散性增强，导致YBCO晶格上的应变比平坦的YBCO晶格上的应变小得多。这导致沿ab平面的正常态电子传导受到的干扰较少，较高的Tc值和由于改进的磁钉扎而提高的Jc值。
Highly splayed BaZrO3 nanorods (BZO-NRs) were generated in YBa2Cu3O7 − δ (YBCO) films doped with 2 vol% BZO on 5° vicinal SrTiO3 (STO) substrates. It was observed that the splay angle of the BZO-NRs around the c-axis increases with film thickness from about 10° at 0.2 µm to 35°–40° at 1 µm. Although the same trend was observed in BZO-NRs in flat YBCO films, the splay angle at a given thickness and its increase with film thickness are significantly smaller. The enhanced dispersion of BZO-NRs in vicinal YBCO/BZO-NR films results in a much reduced strain on the YBCO lattice as compared to its flat counterpart. This led to less disturbed normal-state electron conduction along the ab-plane, higher Tc values and enhanced Jc values due to improved magnetic pinning.