Surface orbital order and chemical potential inhomogeneity of the iron-based superconductor FeTe0.55Se0.45 investigated with special STM tips

Dongfei Wang; Ruidan Zhong; Genda Gu; Roland Wiesendanger

doi:10.1103/PhysRevResearch.3.L032055

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Surface orbital order and chemical potential inhomogeneity of the iron-based superconductor FeTe0.55Se0.45 investigated with special STM tips

Dongfei Wang, Ruidan Zhong, Genda Gu, Roland Wiesendanger

DOI 10.1103/PhysRevResearch.3.L032055 · Physical Review Research

T1

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Abstract

The atomically clean surface of the iron-based superconductor FeTe0.55Se0.45 is investigated by low-temperature scanning tunneling microscope (STM) with different tip apex states. We show that the scattering channel between the Γ and X/Y points of the sample's Brillouin zone can be visualized clearly by a supersharp STM tip. Furthermore, by manipulating a single Fe atom onto the tip apex, signatures of the orbital nature of the subsurface Fe layer of FeTe0.55Se0.45 can be identified. By preparing a charged tip state, the intrinsic spatial inhomogeneity of the chemical potential of FeTe0.55Se0.45 can be revealed. As a result, three different types of vortex bound states originating from locally varying topological properties of the FeTe0.55Se0.45 surface are observed by scanning tunneling spectroscopy.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
FeTe0.55Se0.45 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown