Evidence for unidirectional nematic bond ordering in FeSe. / Watson, Matthew D.; Kim, Timur; Rhodes, Luke; Eschrig, Matthias; Hoesch, Moritz; Haghighirad, A. A. ; Coldea, Amalia I.

In: Physical Review B, Vol. 94, No. 20, 201107(R), 11.11.2016.

Research output: Contribution to journalLetterpeer-review

Published

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Evidence for unidirectional nematic bond ordering in FeSe. / Watson, Matthew D.; Kim, Timur; Rhodes, Luke; Eschrig, Matthias; Hoesch, Moritz; Haghighirad, A. A. ; Coldea, Amalia I.

In: Physical Review B, Vol. 94, No. 20, 201107(R), 11.11.2016.

Research output: Contribution to journalLetterpeer-review

Harvard

Watson, MD, Kim, T, Rhodes, L, Eschrig, M, Hoesch, M, Haghighirad, AA & Coldea, AI 2016, 'Evidence for unidirectional nematic bond ordering in FeSe', Physical Review B, vol. 94, no. 20, 201107(R). https://doi.org/10.1103/PhysRevB.94.201107

APA

Watson, M. D., Kim, T., Rhodes, L., Eschrig, M., Hoesch, M., Haghighirad, A. A., & Coldea, A. I. (2016). Evidence for unidirectional nematic bond ordering in FeSe. Physical Review B, 94(20), [201107(R)]. https://doi.org/10.1103/PhysRevB.94.201107

Vancouver

Watson MD, Kim T, Rhodes L, Eschrig M, Hoesch M, Haghighirad AA et al. Evidence for unidirectional nematic bond ordering in FeSe. Physical Review B. 2016 Nov 11;94(20). 201107(R). https://doi.org/10.1103/PhysRevB.94.201107

Author

Watson, Matthew D. ; Kim, Timur ; Rhodes, Luke ; Eschrig, Matthias ; Hoesch, Moritz ; Haghighirad, A. A. ; Coldea, Amalia I. / Evidence for unidirectional nematic bond ordering in FeSe. In: Physical Review B. 2016 ; Vol. 94, No. 20.

BibTeX

@article{9aad568b88c24942bed456ca0924107c,
title = "Evidence for unidirectional nematic bond ordering in FeSe",
abstract = "The lifting of dxz-dyz orbital degeneracy is often considered a hallmark of the nematic phase of Fe-based superconductors, including FeSe, but its origin is not yet understood. Here we report a high resolution Angle-Resolved Photoemission Spectroscopy study of single crystals of FeSe, accounting for the photon-energy dependence and making a detailed analysis of the temperature dependence. We find that the hole pocket undergoes a fourfold-symmetry-breaking distortion in the nematic phase below 90K, but in contrast the changes to the electron pockets do not require fourfold symmetry-breaking. Instead, there is an additional separation of the existing dxy and dxz/yz bands - which themselves are not split within resolution. These observations lead us to propose a new scenario of {"}unidirectional nematic bond ordering{"} to describe the low-temperature electronic structure of FeSe, supported by a good agreement with 10-orbital tight binding model calculations. ",
author = "Watson, {Matthew D.} and Timur Kim and Luke Rhodes and Matthias Eschrig and Moritz Hoesch and Haghighirad, {A. A.} and Coldea, {Amalia I.}",
year = "2016",
month = nov,
day = "11",
doi = "10.1103/PhysRevB.94.201107",
language = "English",
volume = "94",
journal = "Physical Review B",
issn = "1098-0121",
publisher = "American Physical Society",
number = "20",

}

RIS

TY - JOUR

T1 - Evidence for unidirectional nematic bond ordering in FeSe

AU - Watson, Matthew D.

AU - Kim, Timur

AU - Rhodes, Luke

AU - Eschrig, Matthias

AU - Hoesch, Moritz

AU - Haghighirad, A. A.

AU - Coldea, Amalia I.

PY - 2016/11/11

Y1 - 2016/11/11

N2 - The lifting of dxz-dyz orbital degeneracy is often considered a hallmark of the nematic phase of Fe-based superconductors, including FeSe, but its origin is not yet understood. Here we report a high resolution Angle-Resolved Photoemission Spectroscopy study of single crystals of FeSe, accounting for the photon-energy dependence and making a detailed analysis of the temperature dependence. We find that the hole pocket undergoes a fourfold-symmetry-breaking distortion in the nematic phase below 90K, but in contrast the changes to the electron pockets do not require fourfold symmetry-breaking. Instead, there is an additional separation of the existing dxy and dxz/yz bands - which themselves are not split within resolution. These observations lead us to propose a new scenario of "unidirectional nematic bond ordering" to describe the low-temperature electronic structure of FeSe, supported by a good agreement with 10-orbital tight binding model calculations.

AB - The lifting of dxz-dyz orbital degeneracy is often considered a hallmark of the nematic phase of Fe-based superconductors, including FeSe, but its origin is not yet understood. Here we report a high resolution Angle-Resolved Photoemission Spectroscopy study of single crystals of FeSe, accounting for the photon-energy dependence and making a detailed analysis of the temperature dependence. We find that the hole pocket undergoes a fourfold-symmetry-breaking distortion in the nematic phase below 90K, but in contrast the changes to the electron pockets do not require fourfold symmetry-breaking. Instead, there is an additional separation of the existing dxy and dxz/yz bands - which themselves are not split within resolution. These observations lead us to propose a new scenario of "unidirectional nematic bond ordering" to describe the low-temperature electronic structure of FeSe, supported by a good agreement with 10-orbital tight binding model calculations.

U2 - 10.1103/PhysRevB.94.201107

DO - 10.1103/PhysRevB.94.201107

M3 - Letter

VL - 94

JO - Physical Review B

JF - Physical Review B

SN - 1098-0121

IS - 20

M1 - 201107(R)

ER -