Raman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO3

Abstract The Jahn–Teller (JT) effect, through geometric deformation of molecules or local ionic lattices, lowers the overall energy of the system by removing electron degeneracy from partially occupied orbitals. Crystal symmetry lowered by JT distortion inevitably creates multiple variants of elasti...

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Autores principales:	Yong-Jin Kim, Heung-Sik Park, Chan-Ho Yang
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/e2a9538dc271440d9014aa49cf3d795e
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spelling	oai:doaj.org-article:e2a9538dc271440d9014aa49cf3d795e2021-12-02T18:02:53ZRaman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO310.1038/s41535-021-00361-22397-4648https://doaj.org/article/e2a9538dc271440d9014aa49cf3d795e2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00361-2https://doaj.org/toc/2397-4648Abstract The Jahn–Teller (JT) effect, through geometric deformation of molecules or local ionic lattices, lowers the overall energy of the system by removing electron degeneracy from partially occupied orbitals. Crystal symmetry lowered by JT distortion inevitably creates multiple variants of elastic and orbital-anisotropic states. Visualization and control of the domain/wall textures create a cornerstone to understand various correlated phenomena and explore wall properties. Here, we report the real-space observation of JT phonon and orbiton-related domains in a LaMnO3 thin film using confocal Raman spectromicroscopy. The characteristic symmetries of the JT-originated Raman modes allow us to detect and visualize the local population and orientation of the JT planes. Combined with a crystal structural analysis, we find that the formation of ferroelastic domains with W or W’ walls provides the basic framework for understanding JT domain textures. Furthermore, we demonstrate the JT domains can be manipulated by applying local external stress. Our findings provide a useful pathway for mechanically-tunable orbitronic applications.Yong-Jin KimHeung-Sik ParkChan-Ho YangNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-11 (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 Yong-Jin Kim Heung-Sik Park Chan-Ho Yang Raman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO3
description	Abstract The Jahn–Teller (JT) effect, through geometric deformation of molecules or local ionic lattices, lowers the overall energy of the system by removing electron degeneracy from partially occupied orbitals. Crystal symmetry lowered by JT distortion inevitably creates multiple variants of elastic and orbital-anisotropic states. Visualization and control of the domain/wall textures create a cornerstone to understand various correlated phenomena and explore wall properties. Here, we report the real-space observation of JT phonon and orbiton-related domains in a LaMnO3 thin film using confocal Raman spectromicroscopy. The characteristic symmetries of the JT-originated Raman modes allow us to detect and visualize the local population and orientation of the JT planes. Combined with a crystal structural analysis, we find that the formation of ferroelastic domains with W or W’ walls provides the basic framework for understanding JT domain textures. Furthermore, we demonstrate the JT domains can be manipulated by applying local external stress. Our findings provide a useful pathway for mechanically-tunable orbitronic applications.
format	article
author	Yong-Jin Kim Heung-Sik Park Chan-Ho Yang
author_facet	Yong-Jin Kim Heung-Sik Park Chan-Ho Yang
author_sort	Yong-Jin Kim
title	Raman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO3
title_short	Raman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO3
title_full	Raman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO3
title_fullStr	Raman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO3
title_full_unstemmed	Raman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO3
title_sort	raman imaging of ferroelastically configurable jahn–teller domains in lamno3
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e2a9538dc271440d9014aa49cf3d795e
work_keys_str_mv	AT yongjinkim ramanimagingofferroelasticallyconfigurablejahntellerdomainsinlamno3 AT heungsikpark ramanimagingofferroelasticallyconfigurablejahntellerdomainsinlamno3 AT chanhoyang ramanimagingofferroelasticallyconfigurablejahntellerdomainsinlamno3
_version_	1718378840770740224

Raman imaging of ferroelastically configurable Jahn–Teller domains in LaMnO3

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