Structural Modulation in LaO0.9F0.1BiSe2 Single Crystals Revealed by Scanning Tunneling Microscopy/Spectroscopy
N Ishida, S Demura, Y Fujisawa, S Ohta, K Miyata, H Sakata
TL;DR
This study uses scanning tunneling microscopy and spectroscopy to investigate LaO0.9F0.1BiSe2 single crystals, revealing supermodulation patterns and metallic behavior at the surface, contributing to understanding of its structural and electronic properties.
Contribution
It provides new insights into the supermodulation phenomena and surface electronic structure of LaO0.9F0.1BiSe2 single crystals using STM/STS techniques.
Findings
Finite local density of states at EF indicating metallicity
Existence of supermodulation along diagonal directions
Supermodulation period of 3 to 5 times the lattice constant
Abstract
We present scanning tunneling microscopy and spectroscopy measurements on a cleaved surface of the LaO0.9F0.1BiSe2 single crystals. Tunneling spectra show a finite local density of states at EF, which is consistent with metallic conductivity in bulk. In addition, the existence of the supermodulation running along the diagonal directions of Bi square lattice was revealed. The period of the supermodulation was about 3 to 5 times the length of the lattice constant. This period is close to that observed in LaO0.5F0.5BiSe2.
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