Evidence for orbital order and its relation to superconductivity in FeSe0.4Te0.6

Udai Raj Singh; Seth C. White; Stefan Schmaus; Vladimir Tsurkan; Alois Loidl; Joachim Deisenhofer; Peter Wahl

doi:10.1126/sciadv.1500206

Evidence for orbital order and its relation to superconductivity in FeSe_0.4Te_0.6

Udai Raj Singh, Seth C. White, Stefan Schmaus, Vladimir Tsurkan, Alois Loidl, Joachim Deisenhofer, Peter Wahl

Research output: Contribution to journal › Article › peer-review

Abstract

The emergence of nematic electronic states which break the symmetry of the underlying lattice is a recurring theme in many correlated electron materials, among them the high temperature copper-oxide and iron-based superconductors. Here we provide evidence for the existence of nematic electronic states in the iron chalcogenide superconductor FeSe_0.4Te_0.6. The symmetry breaking states persist above T_C into the normal state. We find an anisotropic coherence length, which is suppressed in a direction perpendicular to the nematic modulations. We interpret the scattering patterns by comparison with quasiparticle interference patterns obtained within a tight-binding model, accounting for orbital ordering.

Original language	English
Article number	e1500206
Journal	Science Advances
Volume	1
Issue number	9
DOIs	https://doi.org/10.1126/sciadv.1500206
Publication status	Published - 16 Oct 2015

Keywords

Iron-based superconductors
Scanning tunneling microscopy and spectroscopy
Nematicity
Symmetry breaking
Superconductivity
Quasi-particle interference

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10.1126/sciadv.1500206

Singh et al - 2015 - Evidence for orbital order and its relation to sup published
Copyright © 2015, The Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/), which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
Final published version, 2.38 MB

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P. (PI), Baumberger, F. (CoI), Davis, J. C. (CoI), Green, A. (CoI), Hooley, C. (CoI), Keeling, J. M. J. (CoI) & Mackenzie, A. (CoI)
EPSRC
1/09/11 → 31/08/17
Project: Standard

Peter Wahl
- gpw2st-andrews.acuk
- School of Physics and Astronomy - Professor, Director of Research
- Centre for Designer Quantum Materials
- Condensed Matter Physics
Person: Academic

Underpinning Data: Evidence for orbital order and its relation to superconductivity in FeSe0.4Te0.6
Singh, U. R. (Creator), White, S. C. (Creator), Schmaus, S. (Creator), Tsurkan, V. (Creator), Loidl, A. (Creator), Deisenhofer, J. (Creator) & Wahl, P. (Creator), University of St Andrews, 2016
DOI: 10.17630/1def59e5-4f2d-4c10-87d3-44220167402b
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Cite this

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keywords = "Iron-based superconductors, Scanning tunneling microscopy and spectroscopy, Nematicity, Symmetry breaking, Superconductivity, Quasi-particle interference",

author = "{Raj Singh}, Udai and White, {Seth C.} and Stefan Schmaus and Vladimir Tsurkan and Alois Loidl and Joachim Deisenhofer and Peter Wahl",

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AU - Raj Singh, Udai

AU - White, Seth C.

AU - Schmaus, Stefan

AU - Tsurkan, Vladimir

AU - Loidl, Alois

AU - Deisenhofer, Joachim

AU - Wahl, Peter

PY - 2015/10/16

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N2 - The emergence of nematic electronic states which break the symmetry of the underlying lattice is a recurring theme in many correlated electron materials, among them the high temperature copper-oxide and iron-based superconductors. Here we provide evidence for the existence of nematic electronic states in the iron chalcogenide superconductor FeSe0.4Te0.6. The symmetry breaking states persist above TC into the normal state. We find an anisotropic coherence length, which is suppressed in a direction perpendicular to the nematic modulations. We interpret the scattering patterns by comparison with quasiparticle interference patterns obtained within a tight-binding model, accounting for orbital ordering.

AB - The emergence of nematic electronic states which break the symmetry of the underlying lattice is a recurring theme in many correlated electron materials, among them the high temperature copper-oxide and iron-based superconductors. Here we provide evidence for the existence of nematic electronic states in the iron chalcogenide superconductor FeSe0.4Te0.6. The symmetry breaking states persist above TC into the normal state. We find an anisotropic coherence length, which is suppressed in a direction perpendicular to the nematic modulations. We interpret the scattering patterns by comparison with quasiparticle interference patterns obtained within a tight-binding model, accounting for orbital ordering.

KW - Iron-based superconductors

KW - Scanning tunneling microscopy and spectroscopy

KW - Nematicity

KW - Symmetry breaking

KW - Superconductivity

KW - Quasi-particle interference

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M3 - Article

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JO - Science Advances

JF - Science Advances

IS - 9

M1 - e1500206

ER -

Evidence for orbital order and its relation to superconductivity in FeSe0.4Te0.6

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Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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Underpinning Data: Evidence for orbital order and its relation to superconductivity in FeSe0.4Te0.6

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Evidence for orbital order and its relation to superconductivity in FeSe_0.4Te_0.6