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Sci Rep. 2016 Nov 10;6:36834. doi: 10.1038/srep36834.

Effect of nematic ordering on electronic structure of FeSe.

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IFW Dresden, P.O. Box 270116, D-01171, Dresden, Germany.
II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937, Köln, Germany.
St. Petersburg State University, St. Petersburg, 198504, Russia.
Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 7056, Stuttgart, Germany.
Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom.
Institute for Solid State Physics, Karlsruhe Institute of Technology, 70569, Karlsruhe, Germany.


Electronically driven nematic order is often considered as an essential ingredient of high-temperature superconductivity. Its elusive nature in iron-based superconductors resulted in a controversy not only as regards its origin but also as to the degree of its influence on the electronic structure even in the simplest representative material FeSe. Here we utilized angle-resolved photoemission spectroscopy and density functional theory calculations to study the influence of the nematic order on the electronic structure of FeSe and determine its exact energy and momentum scales. Our results strongly suggest that the nematicity in FeSe is electronically driven, we resolve the recent controversy and provide the necessary quantitative experimental basis for a successful theory of superconductivity in iron-based materials which takes into account both, spin-orbit interaction and electronic nematicity.

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