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Electronic properties of the bulk and surface states of Fe1+yTe1−xSex
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Electronic properties of the bulk and surface states of Fe1+yTe1−xSex
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Journal Article
Electronic properties of the bulk and surface states of Fe1+yTe1−xSex
2021
Overview
The idea of employing non-Abelian statistics for error-free quantum computing ignited interest in reports of topological surface superconductivity and Majorana zero modes (MZMs) in FeTe
0.55
Se
0.45
. However, the topological features and superconducting properties are not observed uniformly across the sample surface. The understanding and practical control of these electronic inhomogeneities present a prominent challenge for potential applications. Here, we combine neutron scattering, scanning angle-resolved photoemission spectroscopy, and microprobe composition and resistivity measurements to characterize the electronic state of Fe
1+
y
Te
1−
x
Se
x
. We establish a phase diagram in which the superconductivity is observed only at sufficiently low Fe concentration, in association with distinct antiferromagnetic correlations, whereas the coexisting topological surface state occurs only at sufficiently high Te concentration. We find that FeTe
0.55
Se
0.45
is located very close to both phase boundaries, which explains the inhomogeneity of superconducting and topological states. Our results demonstrate the compositional control required for use of topological MZMs in practical applications.
The compositional dependence of magnetic, superconducting and topological surface states on an iron-based superconductor is reported.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Springer Nature - Nature Publishing Group
