Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films

Abstract The emergence of ferromagnetism in materials where the bulk phase does not show any magnetic order demonstrates that atomically precise films can stabilize distinct ground states and expands the phase space for the discovery of materials. Here, the emergence of long-range magnetic order is...

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Autores principales:	Margaret M. Kane, Arturas Vailionis, Lauren J. Riddiford, Apurva Mehta, Alpha T. N’Diaye, Christoph Klewe, Padraic Shafer, Elke Arenholz, Yuri Suzuki
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/3c0d4c3edd244811bf204bc7f92c4362
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spelling	oai:doaj.org-article:3c0d4c3edd244811bf204bc7f92c43622021-12-02T17:15:32ZEmergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films10.1038/s41535-021-00345-22397-4648https://doaj.org/article/3c0d4c3edd244811bf204bc7f92c43622021-05-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00345-2https://doaj.org/toc/2397-4648Abstract The emergence of ferromagnetism in materials where the bulk phase does not show any magnetic order demonstrates that atomically precise films can stabilize distinct ground states and expands the phase space for the discovery of materials. Here, the emergence of long-range magnetic order is reported in ultrathin (111) LaNiO3 (LNO) films, where bulk LNO is paramagnetic, and the origins of this phase are explained. Transport and structural studies of LNO(111) films indicate that NiO6 octahedral distortions stabilize a magnetic insulating phase at the film/substrate interface and result in a thickness-dependent metal–insulator transition at t = 8 unit cells. Away from this interface, distortions relax and bulk-like conduction is regained. Synchrotron x-ray diffraction and dynamical x-ray diffraction simulations confirm a corresponding out-of-plane unit-cell expansion at the interface of all films. X-ray absorption spectroscopy reveals that distortion stabilizes an increased concentration of Ni2+ ions. Evidence of long-range magnetic order is found in anomalous Hall effect and magnetoresistance measurements, likely due to ferromagnetic superexchange interactions among Ni2+–Ni3+ ions. Together, these results indicate that long-range magnetic ordering and metallicity in LNO(111) films emerges from a balance among the spin, charge, lattice, and orbital degrees of freedom.Margaret M. KaneArturas VailionisLauren J. RiddifordApurva MehtaAlpha T. N’DiayeChristoph KlewePadraic ShaferElke ArenholzYuri SuzukiNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-6 (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 Margaret M. Kane Arturas Vailionis Lauren J. Riddiford Apurva Mehta Alpha T. N’Diaye Christoph Klewe Padraic Shafer Elke Arenholz Yuri Suzuki Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films
description	Abstract The emergence of ferromagnetism in materials where the bulk phase does not show any magnetic order demonstrates that atomically precise films can stabilize distinct ground states and expands the phase space for the discovery of materials. Here, the emergence of long-range magnetic order is reported in ultrathin (111) LaNiO3 (LNO) films, where bulk LNO is paramagnetic, and the origins of this phase are explained. Transport and structural studies of LNO(111) films indicate that NiO6 octahedral distortions stabilize a magnetic insulating phase at the film/substrate interface and result in a thickness-dependent metal–insulator transition at t = 8 unit cells. Away from this interface, distortions relax and bulk-like conduction is regained. Synchrotron x-ray diffraction and dynamical x-ray diffraction simulations confirm a corresponding out-of-plane unit-cell expansion at the interface of all films. X-ray absorption spectroscopy reveals that distortion stabilizes an increased concentration of Ni2+ ions. Evidence of long-range magnetic order is found in anomalous Hall effect and magnetoresistance measurements, likely due to ferromagnetic superexchange interactions among Ni2+–Ni3+ ions. Together, these results indicate that long-range magnetic ordering and metallicity in LNO(111) films emerges from a balance among the spin, charge, lattice, and orbital degrees of freedom.
format	article
author	Margaret M. Kane Arturas Vailionis Lauren J. Riddiford Apurva Mehta Alpha T. N’Diaye Christoph Klewe Padraic Shafer Elke Arenholz Yuri Suzuki
author_facet	Margaret M. Kane Arturas Vailionis Lauren J. Riddiford Apurva Mehta Alpha T. N’Diaye Christoph Klewe Padraic Shafer Elke Arenholz Yuri Suzuki
author_sort	Margaret M. Kane
title	Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films
title_short	Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films
title_full	Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films
title_fullStr	Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films
title_full_unstemmed	Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films
title_sort	emergent long-range magnetic order in ultrathin (111)-oriented lanio3 films
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3c0d4c3edd244811bf204bc7f92c4362
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Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films

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