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Title
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Spatially controlled octahedral rotations and metal-insulator transitions in nickelate superlattices
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Author
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Abstract
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| The properties of correlated oxides can be manipulated by forming short-period superlattices since the layer thicknesses are comparable with the typical length scales of the involved correlations and interface effects. Herein, we studied the metal-insulator transitions (MITs) in tetragonal NdNiO3/SrTiO3 superlattices by controlling the NdNiO3 layer thickness, n in the unit cell, spanning the length scale of the interfacial octahedral coupling. Scanning transmission electron microscopy reveals a crossover from a modulated octahedral superstructure at n = 8 to a uniform nontilt pattern at n = 4, accompanied by a drastically weakened insulating ground state. Upon further reducing n the predominant dimensionality effect continuously raises the MIT temperature, while leaving the antiferromagnetic transition temperature unaltered down to n = 2. Remarkably, the MIT can be enhanced by imposing a sufficiently large strain even with strongly suppressed octahedral rotations. Our results demonstrate the relevance for the control of oxide functionalities at reduced dimensions. |
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Language
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English
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Source (journal)
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Nano letters / American Chemical Society. - Washington
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Publication
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Washington
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2021
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ISSN
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1530-6984
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DOI
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10.1021/ACS.NANOLETT.0C03850
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Volume/pages
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21
:3
(2021)
, p. 1295-1302
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ISI
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000619638600014
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Pubmed ID
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33470113
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Full text (Publisher's DOI)
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Full text (open access)
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