Nanoscopic netted structure of compositional modulation in (Sm0.33Eu0.33Gd0.33)Ba2Cu3O7−δ superconductors
Nanoscopic netted structure of compositional modulation in (Sm0.33Eu0.33Gd0.33)Ba2Cu3O7−δ superconductors
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(Sm0.33Eu0.33Gd0.33)Ba2Cu3O7−δ 超导体成分调制的纳米网状结构
DOI：
10.1063/1.1871348
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发表时间：
2005
影响因子：
4
通讯作者：
Haosen Zhou
中科院分区：
文献类型：
--
作者：
A. Hu;I. Hirabayashi;M. Winter;M. Koblischka;U. Hartmann;Haosen Zhou
我们报告了一个纳米尺度的十字形网络在高品质的熔融加工（Sm0.33Eu0.33Gd0.33）Ba2Cu3O7−δ超导体研究与原子力显微镜（AFM）和透射电子显微镜。在10微米尺度下，这种网状结构是由有序成分调制产生的交叉环形条纹所形成的。AFM形貌图像进一步显示，这种组成条纹导致具有几纳米波长和粗糙度的表面调制。结合稀土scinBa在化学计量比附近的振荡和局部Tc值的空间涨落，讨论了这种组分条纹的形成机制及其作为强δ Tc型钉扎缺陷的作用。
We report a nanoscaled crisscross network in high-quality melt-processed (Sm0.33Eu0.33Gd0.33)Ba2Cu3O7−δ superconductors investigated with atomic force microscopy (AFM) and transmission electron microscopy. In the ten-micrometer scale, such a net was unveiled as a consequence of crossing annular stripes originating from ordering compositional modulation. The AFM topographic images further displayed that this compositional stripe result in a surface modulation with a few-nanometer wavelength and roughness. The forming mechanism of this compositional stripe and its role as strong δTc-type pinning defects were discussed in the context of rare earth∕Ba oscillation around the stoichiometric ratio and the spatial fluctuation of local Tc values.