Host: The Japan Society of Vacuum and Surface Science
Monolayer iron selenide (ML FeSe) on strontium titanate (STO) is a superconductor with Tc over 60 K, in which the STO substrate plays an important role in the high Tc. To figure out the local effect of the STO surface reconstruction on ML FeSe, we use low temperature (5 K) scanning tunneling microscopy/spectroscopy (STM/STS) to measure the correlation between the surface structure and the electronic state as well as the superconductivity of ML FeSe/STO -√13×√13. In the atomically-resolved STM images, we observed 1×1-only area, periodically arranged 'z'-like patterns, and dumbbell-like defects. The STS spectra have been simultaneously measured in the corresponding regions on the surface and the details will be shown in the presentation.
