Spatially Controlled Octahedral Rotations and Metal–Insulator Transitions in Nickelate Superlattices
| Autor: | Johan Verbeeck, Robert J. Green, Guus Rijnders, Matjaž Spreitzer, Gertjan Koster, Daen Jannis, Nicolas Gauquelin, Jin Hong Lee, Manuel Bibes, Cinthia Piamonteze, Binbin Chen, Mark Huijben |
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| Přispěvatelé: | Inorganic Materials Science, MESA+ Institute |
| Rok vydání: | 2021 |
| Předmět: |
Length scale
Letter Materials science Superlattice UT-Hybrid-D Bioengineering 02 engineering and technology dimensionality Tetragonal crystal system strain Scanning transmission electron microscopy Antiferromagnetism General Materials Science metal-insulator transition Metal–insulator transition Superstructure metal−insulator transition Condensed matter physics Physics Mechanical Engineering Transition temperature nickelate superlattice General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Chemistry oxygen octahedral rotations 0210 nano-technology Engineering sciences. Technology |
| Zdroj: | Nano letters, 21(3), 1295-1302. American Chemical Society Nano letters Nano Letters |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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