Non-local dxy nematicity and the missing electron pocket in FeSe
Abstract
The origin of spontaneous electronic nematic ordering provides important information for understanding iron-based superconductors. Here, we analyze a scenario where the dxy orbital strongly contributes to nematic ordering in FeSe. We show that the addition of dxy nematicity to a pure dxz/dyz order provides a natural explanation for the unusual Fermi surface and correctly reproduces the strongly anisotropic momentum dependence of the superconducting gap. We predict a Lifshitz transition of an electron pocket mediated by temperature and sulfur doping, whose signatures we discuss by analysing available experimental data. We present the variation of momentum dependence of the superconducting gap upon suppression of nematicity. Our quantitatively accurate model yields the transition from tetragonal to nematic FeSe and the FeSe1−xSx series, and puts strong constraints on possible nematic mechanisms.
Citation
Rhodes , L C , Böker , J , Müller , M A , Eschrig , M & Eremin , I M 2021 , ' Non-local d xy nematicity and the missing electron pocket in FeSe ' , npj Quantum Materials , vol. 6 , 45 . https://doi.org/10.1038/s41535-021-00341-6
Publication
npj Quantum Materials
Status
Peer reviewed
ISSN
2397-4648Type
Journal article
Rights
Copyright © The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
Description
L.C.R. acknowledges funding from the Royal Commission for the Exhibition of 1851. J.B., M.A.M. and I.M.E. gratefully acknowledge financial support by the German Research Foundation within the bilateral NSFC-DFG Project ER 463/14-1. Open Access funding enabled and organized by Projekt DEAL.Collections
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