Non-local dxy nematicity and the missing electron pocket in FeSe

Luke C. Rhodes; Jakob Böker; Marvin A. Müller; Matthias Eschrig; Ilya M. Eremin

doi:10.1038/s41535-021-00341-6

Non-local d_xy nematicity and the missing electron pocket in FeSe

Luke C. Rhodes^*, Jakob Böker^*, Marvin A. Müller, Matthias Eschrig, Ilya M. Eremin^*

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

The origin of spontaneous electronic nematic ordering provides important information for understanding iron-based superconductors. Here, we analyze a scenario where the d_xy orbital strongly contributes to nematic ordering in FeSe. We show that the addition of d_xy nematicity to a pure d_xz/d_yz 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 FeSe_1−xS_x series, and puts strong constraints on possible nematic mechanisms.

Original language	English
Article number	45
Number of pages	14
Journal	npj Quantum Materials
Volume	6
DOIs	https://doi.org/10.1038/s41535-021-00341-6
Publication status	Published - 12 May 2021

Keywords

Electronic properties and matierlas
Superconducting properties and matierals

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Cite this

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title = "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.",

keywords = "Electronic properties and matierlas, Superconducting properties and matierals",

author = "Rhodes, {Luke C.} and Jakob B{\"o}ker and M{\"u}ller, {Marvin A.} and Matthias Eschrig and Eremin, {Ilya M.}",

note = "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.",

year = "2021",

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doi = "10.1038/s41535-021-00341-6",

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T1 - Non-local dxy nematicity and the missing electron pocket in FeSe

AU - Rhodes, Luke C.

AU - Böker, Jakob

AU - Müller, Marvin A.

AU - Eschrig, Matthias

AU - Eremin, Ilya M.

N1 - 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.

PY - 2021/5/12

Y1 - 2021/5/12

N2 - 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.

AB - 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.

KW - Electronic properties and matierlas

KW - Superconducting properties and matierals

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