Surface Adatom Conductance Filtering in Scanning Tunneling Spectroscopy of Co-doped BaFe2As2 Iron Pnictide Superconductors
K. Koepernik, S. Johnston, E. van Heumen, Y. Huang, J. Kaas, J. B. Goedkoop, M. S. Golden, Jeroen van den Brink
DOI 10.1103/PhysRevLett.109.127001 · Physical Review Letters
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Abstract
We establish in a combination of ab initio theory and experiments that the tunneling process in scanning tunneling microscopy or spectroscopy on the A-122 iron pnictide superconductors—in this case BaFe2−xCoxAs2—involves a strong adatom filtering of the differential conductance from the near-EF Fe−3d states, which in turn originates from the topmost subsurface Fe layer of the crystal. The calculations show that the dominance of surface Ba-related tunneling pathways leaves fingerprints found in the experimental differential conductance data, including large particle-hole asymmetry and energy-dependent contrast inversion in conductance maps.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2-xCoxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
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