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首页> 外文期刊>Physica, C. Superconductivity and its applications >Properties of YBa2Cu3O7-delta thin films grown on vicinal SrTiO3 (001) substrates
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Properties of YBa2Cu3O7-delta thin films grown on vicinal SrTiO3 (001) substrates

机译：在邻近的SrTiO3（001）衬底上生长的YBa2Cu3O7-δ薄膜的性能

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We report on the structural and electrical properties of YBa2Cu3O7-delta films grown on 2 degrees, 4 degrees and 6 degrees vicinal SrTiO3 (001) substrates. X-ray diffraction analysis revealed the alignment of the YBa2Cu3O7-delta c-axis with the substrate [001] tilted axis and good crystalline quality of the films. A largely regular surface morphology, characteristic of step-flow growth, was observed by means of atomic force microscopy and scanning tunnelling microscopy. The step height h(s) in the regular film area was of the order of the YBa2Cu3O7-delta unit Cell height in the c-direction. The terrace width w(T) decreased with increasing vicinal angle according to the relation w(T) = h(s)/tan(theta(vic)). In addition we observed holes and surface regions with sub-unit cell steps and merged individual steps (step bunching). The surface topology suggests that defects such as planar antiphase boundaries and impurities result in a localised reduction of the step velocity and in the pinning of the step growth front. Transport measurements showed an anisotropy of the in-plane resistivity but not of the critical temperature (90 K along and across the steps). The angular dependence of the critical current density is briefly reported, (C) 1998 Elsevier Science B.V. All rights reserved. [References: 26]
机译：我们报告了在2度，4度和6度邻域SrTiO3（001）衬底上生长的YBa2Cu3O7-δ薄膜的结构和电学性质。 X射线衍射分析显示YBa2Cu3O7-δc轴与基底[001]倾斜轴的对准和膜的良好结晶质量。通过原子力显微镜和扫描隧道显微镜观察到了基本上规则的表面形貌，其为逐步流动的特征。规则膜区域中的台阶高度h在c方向上为YBa 2 Cu 3 O 7-δ单位晶胞高度的量级。台面宽度w（T）随着毗连角的增加而减小，这取决于关系w（T）= h（s）/ tan（theta（vic））。此外，我们观察到了具有亚单位单元阶梯的孔和表面区域，并合并了单个阶梯（阶梯成束）。表面拓扑表明，诸如平面反相边界和杂质之类的缺陷会导致步进速度的局部降低以及步进生长前沿的钉扎。传输测量结果显示面内电阻率具有各向异性，但临界温度却没有各向异性（沿阶跃及跨阶跃为90 K）。 （C）1998 Elsevier Science B.V.简要报道了临界电流密度与角度的关系。保留所有权利。 [参考：26]

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