Abstract
We have performed scanning tunneling microscopy/spectroscopy (STM/STS) on single crystals of heavily Pb-doped Bi 2 Sr 2 CaCu 2 O y (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 T c . This suggests that the phase boundaries act as strong pinning sites especially at higher temperatures.
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Nakao, S., Ueno, K., Hanaguri, T. et al. Electronic Structures of Two-Phase Microstructures in Pb-doped Bi2Sr2CaCu2O y . Journal of Low Temperature Physics 117, 341–345 (1999). https://doi.org/10.1023/A:1022561415022
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DOI: https://doi.org/10.1023/A:1022561415022