Singular magnetic anisotropy in the nematic phase of FeSe

Abstract FeSe is arguably the simplest, yet the most enigmatic, iron-based superconductor. Its nematic but non-magnetic ground state is unprecedented in this class of materials and stands out as a current puzzle. Here, our nuclear magnetic resonance measurements in the nematic state of mechanically...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Rui Zhou, Daniel D. Scherer, Hadrien Mayaffre, Pierre Toulemonde, Mingwei Ma, Yuan Li, Brian M. Andersen, Marc-Henri Julien
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/30ba55631f1a4b3a80db8092eaf20eaf
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:30ba55631f1a4b3a80db8092eaf20eaf
record_format	dspace
spelling	oai:doaj.org-article:30ba55631f1a4b3a80db8092eaf20eaf2021-12-02T16:00:40ZSingular magnetic anisotropy in the nematic phase of FeSe10.1038/s41535-020-00295-12397-4648https://doaj.org/article/30ba55631f1a4b3a80db8092eaf20eaf2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41535-020-00295-1https://doaj.org/toc/2397-4648Abstract FeSe is arguably the simplest, yet the most enigmatic, iron-based superconductor. Its nematic but non-magnetic ground state is unprecedented in this class of materials and stands out as a current puzzle. Here, our nuclear magnetic resonance measurements in the nematic state of mechanically detwinned FeSe reveal that both the Knight-shift and the spin–lattice relaxation rate 1/T 1 possess an in-plane anisotropy opposite to that of the iron pnictides LaFeAsO and BaFe2As2. Using a microscopic electron model that includes spin–orbit coupling, our calculations show that an opposite quasiparticle weight ratio between the d x z and d y z orbitals leads to an opposite anisotropy of the orbital magnetic susceptibility, which explains our Knight-shift results. We attribute this property to a different nature of nematic order in the two compounds, predominantly bond type in FeSe and onsite ferro-orbital in pnictides. The T 1 anisotropy is found to be inconsistent with existing neutron scattering data in FeSe, showing that the spin fluctuation spectrum reveals surprises at low energy, possibly from fluctuations that do not break C 4 symmetry. Therefore, our results reveal that important information is hidden in these anisotropies and they place stringent constraints on the low-energy spin correlations as well as on the nature of nematicity in FeSe.Rui ZhouDaniel D. SchererHadrien MayaffrePierre ToulemondeMingwei MaYuan LiBrian M. AndersenMarc-Henri JulienNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 5, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Rui Zhou Daniel D. Scherer Hadrien Mayaffre Pierre Toulemonde Mingwei Ma Yuan Li Brian M. Andersen Marc-Henri Julien Singular magnetic anisotropy in the nematic phase of FeSe
description	Abstract FeSe is arguably the simplest, yet the most enigmatic, iron-based superconductor. Its nematic but non-magnetic ground state is unprecedented in this class of materials and stands out as a current puzzle. Here, our nuclear magnetic resonance measurements in the nematic state of mechanically detwinned FeSe reveal that both the Knight-shift and the spin–lattice relaxation rate 1/T 1 possess an in-plane anisotropy opposite to that of the iron pnictides LaFeAsO and BaFe2As2. Using a microscopic electron model that includes spin–orbit coupling, our calculations show that an opposite quasiparticle weight ratio between the d x z and d y z orbitals leads to an opposite anisotropy of the orbital magnetic susceptibility, which explains our Knight-shift results. We attribute this property to a different nature of nematic order in the two compounds, predominantly bond type in FeSe and onsite ferro-orbital in pnictides. The T 1 anisotropy is found to be inconsistent with existing neutron scattering data in FeSe, showing that the spin fluctuation spectrum reveals surprises at low energy, possibly from fluctuations that do not break C 4 symmetry. Therefore, our results reveal that important information is hidden in these anisotropies and they place stringent constraints on the low-energy spin correlations as well as on the nature of nematicity in FeSe.
format	article
author	Rui Zhou Daniel D. Scherer Hadrien Mayaffre Pierre Toulemonde Mingwei Ma Yuan Li Brian M. Andersen Marc-Henri Julien
author_facet	Rui Zhou Daniel D. Scherer Hadrien Mayaffre Pierre Toulemonde Mingwei Ma Yuan Li Brian M. Andersen Marc-Henri Julien
author_sort	Rui Zhou
title	Singular magnetic anisotropy in the nematic phase of FeSe
title_short	Singular magnetic anisotropy in the nematic phase of FeSe
title_full	Singular magnetic anisotropy in the nematic phase of FeSe
title_fullStr	Singular magnetic anisotropy in the nematic phase of FeSe
title_full_unstemmed	Singular magnetic anisotropy in the nematic phase of FeSe
title_sort	singular magnetic anisotropy in the nematic phase of fese
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/30ba55631f1a4b3a80db8092eaf20eaf
work_keys_str_mv	AT ruizhou singularmagneticanisotropyinthenematicphaseoffese AT danieldscherer singularmagneticanisotropyinthenematicphaseoffese AT hadrienmayaffre singularmagneticanisotropyinthenematicphaseoffese AT pierretoulemonde singularmagneticanisotropyinthenematicphaseoffese AT mingweima singularmagneticanisotropyinthenematicphaseoffese AT yuanli singularmagneticanisotropyinthenematicphaseoffese AT brianmandersen singularmagneticanisotropyinthenematicphaseoffese AT marchenrijulien singularmagneticanisotropyinthenematicphaseoffese
_version_	1718385263674130432

Singular magnetic anisotropy in the nematic phase of FeSe

Ejemplares similares