Surface Geometric and Electronic Structure of BaFe2As2(001)
V.B. Nascimento, Ang Li, Dilushan R. Jayasundara, Yi Xuan, Jared, O'Neal, Shuheng Pan, T. Y. Chien, Biao Hu, X.B. He, Guorong Li, A. S. Sefat,, M. A. McGuire, B. C. Sales, D. Mandrus, M.H. Pan, Jiandi Zhang, R. Jin, and, E.W. Plummer
TL;DR
This study combines STM/S and LEED techniques to characterize the surface structure of BaFe2As2, revealing an ordered As-terminated surface with specific electronic properties relevant to high-temperature superconductivity.
Contribution
It provides the first detailed surface structural and electronic characterization of BaFe2As2(001) using combined STM/S and LEED methods.
Findings
Identified the surface as an As-terminated Fe-As layer
Found no surface reconstruction or lattice distortion
Observed STM imaging of Fe-As orbitals related to orthorhombic structure
Abstract
BaFe2As2 exhibits properties characteristic of the parent compounds of the newly discovered iron (Fe)-based high-TC superconductors. By combining the real space imaging of scanning tunneling microscopy/spectroscopy (STM/S) with momentum space quantitative Low Energy Electron Diffraction (LEED) we have identified the surface plane of cleaved BaFe2As2 crystals as the As terminated Fe-As layer - the plane where superconductivity occurs. LEED and STM/S data on the BaFe2As2(001) surface indicate an ordered arsenic (As) - terminated metallic surface without reconstruction or lattice distortion. It is surprising that the STM images the different Fe-As orbitals associated with the orthorhombic structure, not the As atoms in the surface plane.
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