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Evidence for unidirectional nematic bond ordering in FeSe

M. D. Watson, T. K. Kim, L. C. Rhodes, M. Eschrig, M. Hoesch, A. A. Haghighirad, and A. I. Coldea
Phys. Rev. B 94, 201107(R) – Published 11 November 2016
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Abstract

The presence of dxzdyz orbital ordering is often considered a hallmark of the nematic phase of Fe-based superconductors, including FeSe, but the details of the order parameter remain controversial. 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 dxy and dxz/yz bands, which themselves are not split within resolution. These observations lead us to propose a scenario of “unidirectional nematic bond ordering” to describe the low-temperature electronic structure of FeSe, supported by good agreement with ten-orbital tight-binding model calculations.

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  • Received 8 April 2016
  • Revised 2 October 2016

DOI:https://doi.org/10.1103/PhysRevB.94.201107

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.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. D. Watson1,*, T. K. Kim1, L. C. Rhodes2, M. Eschrig2, M. Hoesch1, A. A. Haghighirad3, and A. I. Coldea3

  • 1Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
  • 2Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
  • 3Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom

  • *Author to whom correspondence should be addressed: matthew.watson@diamond.ac.uk

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Issue

Vol. 94, Iss. 20 — 15 November 2016

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