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 Fe1+δTe. 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.
@article{arxiv.1305.7206,
title = {Observation of isosceles triangular electronic structure around excess iron atoms in Fe$_{1+\delta}$Te},
author = {T. Machida and K. Kogure and T. Kato and H. Nakamura and H. Takeya and T. Mochiku and S. Ooi and Y. Mizuguchi and Y. Takano and K. Hirata and H. Sakata},
journal= {arXiv preprint arXiv:1305.7206},
year = {2013}
}
Comments
6 pages, 5 figures, to be published in Phys. Rev. B