The effects of growth temperature on c-axis-correlated pinning centers in PLD-ErBa2Cu3O7−δ films with Ba(Er0.5Nb0.5)O3
The effects of growth temperature on c-axis-correlated pinning centers in PLD-ErBa2Cu3O7−δ films with Ba(Er0.5Nb0.5)O3
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DOI：
10.1088/0953-2048/23/2/025017
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发表时间：
2010-01
影响因子：
3.6
通讯作者：
H. Kai;S. Horii;A. Ichinose;R. Kita;K. Matsumoto;Y. Yoshida;T. Fujiyoshi;R. Teranishi;N. Mori;M. Mukaida
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文献类型：
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作者：
H. Kai;S. Horii;A. Ichinose;R. Kita;K. Matsumoto;Y. Yoshida;T. Fujiyoshi;R. Teranishi;N. Mori;M. Mukaida
从ErBa2Cu3O7−δ一维纳米棒外延薄膜的微观结构和超导性能两方面讨论了温度对薄膜生长的影响。采用脉冲激光沉积方法，在710℃和760℃生长的（100）取向SrTiO3衬底上生长C轴取向banb2o6掺杂ErBa2Cu3O7−δ薄膜。原子力显微镜分析表明，随着生长温度（TS）的降低，三维岛屿上的膜表面台阶增加。然后，TS也改变了纳米棒的形貌，在薄膜的透射电镜图像中可以清晰地观察到Ba(Er0.5Nb0.5)O3纳米棒。在标称BaNb2O6 （BNO）掺杂浓度下，纳米棒在较低TS下更细、密度更大。在TS = 710℃条件下，掺入1.5 wt%BNO的纳米棒直径为4-6 nm，纳米棒的数量密度为2.6 × 1011 cm−2。此外，在较低TS下生长的薄膜中，纳米棒可以有效地作为c轴相关的钉钉中心，因此，通过改变TS，纳米棒的形貌可以控制钉钉效果。
Effects of growth temperatures in epitaxial ErBa2Cu3O7−δ films with one-dimensional nanorods were discussed from their microstructures and superconducting properties. c-axis-oriented BaNb2O6-doped ErBa2Cu3O7−δ films were grown on (100)-oriented SrTiO3 substrates grown at 710 and 760 °C by pulsed-laser deposition. Atomic force microscopy analysis showed that film surface steps on the three-dimensional islands increased with decreasing growth temperature (TS). Then, nanorod morphologies were also changed by TS. Ba(Er0.5Nb0.5)O3 nanorods were observed clearly in transmission electron microscopy images of the films. The nanorods were thinner and denser at a lower TS under a nominal BaNb2O6 (BNO) doping concentration. In the case of TS = 710 °C, the diameter and number density of nanorods with 1.5 wt%BNO doping were 4–6 nm and 2.6 × 1011 cm−2, respectively. Furthermore, the nanorods could effectively act as c-axis-correlated pinning centers in the film grown at a lower TS. Consequently, the pinning effects were controlled by nanorod morphologies through varying the TS.