[1Cp01-13] SS3

[1Cp12S] Local effect of sqrt13xsqrt13 reconstruction on single-layer FeSe/SrTiO₃

*WEN SI¹, TOMOAKI TANAKA¹, SATORU ICHINOKURA¹, TORU HIRAHARA¹ (1. School of Science, Tokyo Institute of Technology)

Monolayer iron selenide (ML FeSe) on strontium titanate (STO) is a superconductor with Tc over 60K, 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 (5K) 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 -√13x√13. In the atomically-resolved STM images, we observed 1x1-only area, periodically arranged 'z'-like patterns, and dumbbell-like defects. The STS spectra have pabeen simultaneously measured in the corresponding regions on the surface and the details will be shown in the presentation.