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

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X.B. He Guorong Li A. S. Sefat M. A. McGuire B. C. Sales D. Mandrus M.H. Pan Jiandi Zhang R. Jin E.W. Plummer

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classification ❄️ cond-mat.mtrl-sci cond-mat.supr-con

keywords surfacebafe2as2planefe-asleedspacestructureterminated

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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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Surface Geometric and Electronic Structure of BaFe2As2(001)

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