Observation of isosceles triangular electronic structure around excess iron atoms in Fe${}_{1+\delta }$Te

Abstract

We present scanning tunneling microscopy and spectroscopy studies around an individual excess Fe atom, working as a local perturbation, in the parent material of the iron-chalcogenide superconductor Fe${}_{1+\delta }$Te. Spectroscopic imaging reveals a novel isosceles triangular electronic structure around the excess Fe atoms. Its spatial symmetry reects the underlying bicollinear antiferromagnetic spin state and the structural monoclinic symmetry. These findings provide important clues to understand the role of the excess Fe atoms, which complicate the understanding of the phenomena occurring in iron-chalcogenide materials.

6 pages, 5 figures, to be published in Phys. Rev. B

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Cited by in corpus (3)

• Charge-Stripe Order in a Parent Compound of Iron-based Superconductors
• Reversed anisotropy of the in-plane resistivity in the antiferromagnetic phase of iron tellurides
• On the bad metallicity and phase diagrams of Fe${}_{1+\delta }X$ ($X$ =Te, Se, S, solid solutions): an electrical resistivity study