Journal article
Evidence for unidirectional nematic bond ordering in FeSe
- Abstract:
- The lifting of $d_{xz}$-$d_{yz}$ 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 90~K, but in contrast the changes to the electron pockets do not require fourfold symmetry-breaking. Instead, there is an additional separation of the existing $d_{xy}$ and $d_{xz/yz}$ 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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 1.7MB, Terms of use)
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- Publisher copy:
- 10.1103/PhysRevB.94.201107
Authors
+ Oxford Quantum
Materials Platform Grant
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- Funding agency for:
- Haghighirad, A
- Grant:
- EP/M020517/1
+ Engineering and Physical Sciences Research Council
More from this funder
- Funding agency for:
- Coldea, A
- Grant:
- Career Acceleration Fellowship (EP/I004475/1
- EP/L001772/1,EP/I004475/1,EP/I017836/1
- Publisher:
- American Physical Society
- Journal:
- Physical Review B More from this journal
- Volume:
- 94
- Pages:
- 201107(R)
- Publication date:
- 2016-01-01
- Acceptance date:
- 2016-10-04
- DOI:
- EISSN:
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2469-9969
- ISSN:
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2469-9950
- Keywords:
- Pubs id:
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pubs:612164
- UUID:
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uuid:0e7b85fd-ba41-4dbb-be59-496c347098ea
- Local pid:
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pubs:612164
- Source identifiers:
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612164
- Deposit date:
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2016-10-13
Terms of use
- Copyright holder:
- American Physical Society
- Copyright date:
- 2016
- Notes:
- Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
- Licence:
- CC Attribution (CC BY)
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