Bi2Sr2CaCu2Oy was studied by the local work function measurement with STM. The modulation with the same periodicity as the superstructure on BiO plane was observed on the work function images. The protrude lines in STM image have lower work function, which supports the model that part of the Bi sites are replaced by Sr atoms in the Bi-deficient bands. This work also suggests that the local work function measurement with STM can provide some information for studying the distribution of charges in high-Tc superconducting oxides.
- A. high-T superconductors
- C. scanning tunneling microscopy
ASJC Scopus subject areas
- Condensed Matter Physics
- Materials Chemistry