Electronic properties of the bulk and surface states of Fe1+yTe1−xSex

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...

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Veröffentlicht in:Nature materials 2021-09, Vol.20 (9), p.1221-1227
Hauptverfasser: Li, Yangmu, Zaki, Nader, Garlea, Vasile O., Savici, Andrei T., Fobes, David, Xu, Zhijun, Camino, Fernando, Petrovic, Cedomir, Gu, Genda, Johnson, Peter D., Tranquada, John M., Zaliznyak, Igor A.
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container_end_page 1227
container_issue 9
container_start_page 1221
container_title Nature materials
container_volume 20
creator Li, Yangmu
Zaki, Nader
Garlea, Vasile O.
Savici, Andrei T.
Fobes, David
Xu, Zhijun
Camino, Fernando
Petrovic, Cedomir
Gu, Genda
Johnson, Peter D.
Tranquada, John M.
Zaliznyak, Igor A.
description 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.
doi_str_mv 10.1038/s41563-021-00984-7
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subjects 639/301/119/1003
639/301/119/2792/4129
639/301/119/995
Antiferromagnetism
Biomaterials
Chemistry and Materials Science
Condensed Matter Physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electron states
electronic properties and materials
Inhomogeneity
Iron
Laboratories
Materials Science
Nanotechnology
Neutron scattering
Optical and Electronic Materials
Phase diagrams
Photoelectric emission
Quantum computing
Single crystals
Spectrum analysis
superconducting properties and materials
Superconductivity
topological defects
Topology
Vortices
title Electronic properties of the bulk and surface states of Fe1+yTe1−xSex
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