Electronic Structures of Two-Phase Microstructures in Pb-doped Bi2Sr2CaCu2Oy
Electronic Structures of Two-Phase Microstructures in Pb-doped Bi2Sr2CaCu2Oy
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Pb 掺杂 Bi2Sr2CaCu2Oy 两相微结构的电子结构
DOI：
10.1023/a:1022561415022
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发表时间：
1999
影响因子：
2
通讯作者：
T. Hasegawa
中科院分区：
文献类型：
--
作者：
S. Nakao;K. Ueno;T. Hanaguri;K. Kitazawa;T. Fujita;Y. Nakayama;T. Motohashi;J. Shimoyama;K. Kishio;T. Hasegawa
我们对重铅掺杂的Bi₂Sr₂CaCu₂Oᵧ（Pb - Bi2212）单晶进行了扫描隧道显微镜/光谱（STM/STS）研究。所获得的STM图像清晰地展示了相分离为具有层状和新型锯齿状微观结构的α相和β相。通过定点隧道测量，直接证实了α相具有更高的临界温度（Tc）。这表明相界起到了强钉扎位点的作用，尤其是在较高温度下。
We have performed scanning tunneling microscopy/spectroscopy (STM/STS) on single crystals of heavily Pb-doped Bi2Sr2CaCu2Oy(Pb-Bi2212). The obtained STM images clearly demonstrated phase separation into the α and β phases with lamella-type and new zigzag-like microstructures. From the site-specified tunneling measurements, it was directly confirmed that the α phase possesses higher Tc. This suggests that the phase boundaries act as strong pinning sites especially at higher temperatures.