Transport properties and flux pinning by self-organization in YBa2Cu3O7-delta films on vicinal SrTiO3(001)
Transport properties and flux pinning by self-organization in YBa2Cu3O7-delta films on vicinal SrTiO3(001)
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DOI：
10.1103/physrevb.56.8404
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发表时间：
1997-10-01
影响因子：
3.7
通讯作者：
Kronmuller, H
中科院分区：
文献类型：
--
作者：
Haage, T;Zegenhagen, J;Kronmuller, H
在c轴沿着SrTiO 3 [001]方向的邻位SrTiO 3（001）衬底上生长YBa_2Cu_3 O_7-δ（YBCO）薄膜，观察到了各向异性的磁通钉扎和电阻率。使用超高真空扫描隧道显微镜和透射电子显微镜，我们证明了一个周期性的纳米级台阶结构的清洁衬底表面上的后续沉积的YBCO薄膜的形貌和缺陷微结构的影响。通过自组织产生的位错线阵导致了异常大的临界电流密度，在4.2K时高达8 × 10 ~（11）A/m ~ 2。研究结果表明，高温超导体的临界电流密度可以提高在定制的衬底表面上生长薄膜的控制方式。
We have observed anisotropic flux pinning and resistivity in the substrate plane of YBa2Cu3O7-delta (YBCO) thin films grown on vicinal SrTiO3(001) with the c axis oriented along the SrTiO3[001] direction. Using UHV scanning tunneling microscopy and transmission electron microscopy we demonstrate the influence of a periodic nanoscale step structure of the clean substrate surface on the morphology and defect microstructure of subsequently deposited YBCO films. A linear array of dislocations generated via self-organization of the YBCO leads to an exceptionally large critical current density up to 8 X 10(11)A/m(2) at 4.2 K. The findings indicate that the critical current density of high-temperature superconductors can be enhanced in a controlled way growing thin films on tailored substrate surfaces.