Surface Geometric and Electronic Structure of BaFe2As2(001)

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.

12 pages, 4 figures

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• Electronic structure of optimally doped pnictide Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$: a comprehensive ARPES investigation
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• ARPES observation of Mn-pnictide hybridization and negligible band structure renormalization in BaMn${}_2$As${}_2$ and BaMn${}_2$Sb${}_2$
• Superconductivity in Undoped BaFe2As2 by Tetrahedral Geometry Design
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• BaFe2As2 Surface Domains and Domain Walls: Mirroring the Bulk Spin Structure
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• Low work function in the 122-family of iron-based superconductors
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• Theoretical study on the anisotropic electronic structure of antiferromagnetic BaFe${}_2$As${}_2$ and Co-doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ seen by angle-resolved photoemission
• Probing Local Variations of Superconductivity on the Surface of Ba(Fe1-xCox)2As2 Single Crystals
• Common ($\pi$,$\pi$) Band Folding and Surface Reconstruction in FeAs-Based Superconductors
• Surface adatom conductance filtering in scanning tunneling spectroscopy of Co-doped BaFe2As2 iron pnictide superconductors
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• Comment on "Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in Fe-As-Based Superconductors"
• Surface reconstruction and charge modulation in BaFe2As2 superconducting film
• Accurate projected augmented wave datasets for BaFe${}_2$As${}_2$
• Tuning the magnetism of the top-layer FeAs on BaFe${}_2$As${}_2$(001): First-principles study
• Enhanced Surface Superconductivity in Ba(Fe${}_{0.95}$Co${}_{0.05}$)${}_2$As${}_2$