Unidirectional Electronic Order in the Parent State of Iron-Chalcogenide Superconductor Fe$_{1+δ}$Te

Details Unidirectional Electronic Order in the Parent State of Iron-Chalcogenide Superconductor Fe$_{1+δ}$Te Unidirectional Electronic Order in the Parent State of Iron-Chalcogenide Superconductor Fe$_{1+δ}$Te

2011-05-24

arxiv.org/abs/1105.4754v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages 5 figures

Scientific paper

We use scanning tunneling microscopy and spectroscopy to explore the electronic structure of Fe$_{1.07}$Te which is the parent compound of the iron-chalcogenide superconductors. Tunneling spectroscopy reveals the particle-hole asymmetry characterized by the greater electron extraction probabilities than those for injection and two gap-like structures with the gap edges at $\sim$ 50 and $\sim$ 130 meV. Within the larger gap, a unidirectional electronic order with a period of $a_{0}$ ($a_{0}$ is lattice constant) along a-axis is observed. From the one-dimensionality of the electronic order, it is conceivable that the structural or antiferromagnetic transition is closely related to the formation of this electronic order. These findings give us important insights into further understanding of the parent state of iron-chalcogenide superconductors.

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