Nematic fluctuations in iron-oxychalcogenide Mott insulators

Abstract Nematic fluctuations occur in a wide range physical systems from biological molecules to cuprates and iron pnictide high-T c superconductors. It is unclear whether nematicity in pnictides arises from electronic spin or orbital degrees of freedom. We studied the iron-based Mott insulators La...

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Autores principales:	B. Freelon, R. Sarkar, S. Kamusella, F. Brückner, V. Grinenko, Swagata Acharya, Mukul Laad, Luis Craco, Zahra Yamani, Roxana Flacau, Ian Swainson, Benjamin Frandsen, Robert Birgeneau, Yuhao Liu, Bhupendra Karki, Alaa Alfailakawi, Joerg C. Neuefeind, Michelle Everett, Hangdong Wang, Binjie Xu, Minghu Fang, H.-H. Klauss
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
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/32d94f336091495db36732b10d94a43e
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spelling	oai:doaj.org-article:32d94f336091495db36732b10d94a43e2021-12-02T14:24:00ZNematic fluctuations in iron-oxychalcogenide Mott insulators10.1038/s41535-020-00302-52397-4648https://doaj.org/article/32d94f336091495db36732b10d94a43e2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41535-020-00302-5https://doaj.org/toc/2397-4648Abstract Nematic fluctuations occur in a wide range physical systems from biological molecules to cuprates and iron pnictide high-T c superconductors. It is unclear whether nematicity in pnictides arises from electronic spin or orbital degrees of freedom. We studied the iron-based Mott insulators La2O2Fe2OM2M = (S, Se), which are structurally similar to pnictides. Nuclear magnetic resonance revealed a critical slowing down of nematic fluctuations and complementary Mössbauerr spectroscopy data showed a change of electrical field gradient. The neutron pair distribution function technique detected local C 2 fluctuations while neutron diffraction indicates that global C4 symmetry is preserved. A geometrically frustrated Heisenberg model with biquadratic and single-ion anisotropic terms provides the interpretation of the low temperature magnetic fluctuations. The nematicity is not due to spontaneous orbital order, instead it is linked to geometrically frustrated magnetism based on orbital selectivity. This study highlights the interplay between orbital order and spin fluctuations in nematicity.B. FreelonR. SarkarS. KamusellaF. BrücknerV. GrinenkoSwagata AcharyaMukul LaadLuis CracoZahra YamaniRoxana FlacauIan SwainsonBenjamin FrandsenRobert BirgeneauYuhao LiuBhupendra KarkiAlaa AlfailakawiJoerg C. NeuefeindMichelle EverettHangdong WangBinjie XuMinghu FangH.-H. KlaussNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-8 (2021)
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 B. Freelon R. Sarkar S. Kamusella F. Brückner V. Grinenko Swagata Acharya Mukul Laad Luis Craco Zahra Yamani Roxana Flacau Ian Swainson Benjamin Frandsen Robert Birgeneau Yuhao Liu Bhupendra Karki Alaa Alfailakawi Joerg C. Neuefeind Michelle Everett Hangdong Wang Binjie Xu Minghu Fang H.-H. Klauss Nematic fluctuations in iron-oxychalcogenide Mott insulators
description	Abstract Nematic fluctuations occur in a wide range physical systems from biological molecules to cuprates and iron pnictide high-T c superconductors. It is unclear whether nematicity in pnictides arises from electronic spin or orbital degrees of freedom. We studied the iron-based Mott insulators La2O2Fe2OM2M = (S, Se), which are structurally similar to pnictides. Nuclear magnetic resonance revealed a critical slowing down of nematic fluctuations and complementary Mössbauerr spectroscopy data showed a change of electrical field gradient. The neutron pair distribution function technique detected local C 2 fluctuations while neutron diffraction indicates that global C4 symmetry is preserved. A geometrically frustrated Heisenberg model with biquadratic and single-ion anisotropic terms provides the interpretation of the low temperature magnetic fluctuations. The nematicity is not due to spontaneous orbital order, instead it is linked to geometrically frustrated magnetism based on orbital selectivity. This study highlights the interplay between orbital order and spin fluctuations in nematicity.
format	article
author	B. Freelon R. Sarkar S. Kamusella F. Brückner V. Grinenko Swagata Acharya Mukul Laad Luis Craco Zahra Yamani Roxana Flacau Ian Swainson Benjamin Frandsen Robert Birgeneau Yuhao Liu Bhupendra Karki Alaa Alfailakawi Joerg C. Neuefeind Michelle Everett Hangdong Wang Binjie Xu Minghu Fang H.-H. Klauss
author_facet	B. Freelon R. Sarkar S. Kamusella F. Brückner V. Grinenko Swagata Acharya Mukul Laad Luis Craco Zahra Yamani Roxana Flacau Ian Swainson Benjamin Frandsen Robert Birgeneau Yuhao Liu Bhupendra Karki Alaa Alfailakawi Joerg C. Neuefeind Michelle Everett Hangdong Wang Binjie Xu Minghu Fang H.-H. Klauss
author_sort	B. Freelon
title	Nematic fluctuations in iron-oxychalcogenide Mott insulators
title_short	Nematic fluctuations in iron-oxychalcogenide Mott insulators
title_full	Nematic fluctuations in iron-oxychalcogenide Mott insulators
title_fullStr	Nematic fluctuations in iron-oxychalcogenide Mott insulators
title_full_unstemmed	Nematic fluctuations in iron-oxychalcogenide Mott insulators
title_sort	nematic fluctuations in iron-oxychalcogenide mott insulators
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/32d94f336091495db36732b10d94a43e
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Nematic fluctuations in iron-oxychalcogenide Mott insulators

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