Synchrotron radiation x-ray photoemission spectroscopy and high-resolution transmission electron microscopy analysis of Bi2Sr2Can−1CunOy superconducting whiskers with high critical current density
Synchrotron radiation x-ray photoemission spectroscopy and high-resolution transmission electron microscopy analysis of Bi2Sr2Can−1CunOy superconducting whiskers with high critical current density
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高临界电流密度Bi2Sr2Can−1CunOy超导晶须的同步辐射X射线光电子能谱和高分辨率透射电子显微镜分析
DOI：
10.1063/1.3246804
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发表时间：
2009
影响因子：
3.2
通讯作者：
S. Kishida
中科院分区：
文献类型：
--
作者：
Hiromi Tanaka;H. Yoshikawa;S. Ueda;C. Tsuruta;Y. Matsui;T. Ishigaki;S. Honda;S. Kishida
利用同步辐射X射线光电子能谱和高分辨透射电子显微镜研究了用Al_2O_3籽晶玻璃淬冷片晶法生长的富钙铋基超导晶须。富钙铋基超导晶须在40 K自场下具有2×105 A/cm 2的高临界电流密度。 我们发现过量的Ca ~（2+）离子取代了Sr ~（2+）离子的位置，在基体晶体中形成了周期调制短的柱状纳米晶畴。嵌入的纳米晶畴可以导致结构扭曲的缺陷，作为强钉扎中心。
Using synchrotron radiation x-ray photoemission spectroscopy and high-resolution transmission electron microscopy, we have studied Ca-rich Bi-based superconducting whiskers grown by an Al2O3-seeded glassy quenched platelet method. The Ca-rich Bi-based superconducting whiskers show a high critical current density of 2×105 A/cm2 at 40 K in self-field. We found that excess Ca2+ ions substitute for the Sr2+ sites and cause pillar-shaped nanocrystalline domains with shorter period modulation embedded in the base crystalline. The embedded nanocrystalline domains can result in structural distorted defects which work as strong pinning center.