期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 38, 页码 9515-9520出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1807457115
关键词
transition metal oxide; structural modulation; metal-insulator transition; heterostructure; octahedral rotation
资金
- 2-Dimensional Electron Systems in Complex Oxides (DESCO) program of the Dutch Foundation for Fundamental Research on Matter (FOM)
- Netherlands Organization for Scientific Research (NWO)
- European Union Council under the 7th Framework Program (FP7) Grant [NMP3-LA-2010-246102 IFOX]
- FWO Projects [G.0044.13N, G.0374.13N, G. 0368.15N, G.0369.15N]
- Hercules fund from the Flemish Government
- European Research Council (ERC) under the FP7, ERC Starting Grant [278510 VORTEX]
- European Union [312483-ESTEEM2]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Max Planck-University of British Columbia (UBC) Centre for Quantum Materials
- Canada Foundation for Innovation, NSERC
- National Research Council of Canada
- Canadian Institutes of Health Research
- Government of Saskatchewan, Western Economic Diversification Canada
- University of Saskatchewan
- ERC
- ERC Consolidator Grant [MINT 615759]
- Action de Recherche Concertee (ARC) project AIMED
- National Scientific Research Funds
- F.R.S.-FNRS [2.5020.1]
- Walloon Region [1117545]
In transition metal perovskites ABO(3), the physical properties are largely driven by the rotations of the BO6 octahedra, which can be tuned in thin films through strain and dimensionality control. However, both approaches have fundamental and practical limitations due to discrete and indirect variations in bond angles, bond lengths, and film symmetry by using commercially available substrates. Here, we introduce modulation tilt control as an approach to tune the ground state of perovskite oxide thin films by acting explicitly on the oxygen octahedra rotation modes-that is, directly on the bond angles. By intercalating the prototype SmNiO3 target material with a tilt-control layer, we cause the system to change the natural amplitude of a given rotation mode without affecting the interactions. In contrast to strain and dimensionality engineering, our method enables a continuous fine-tuning of the materials' properties. This is achieved through two independent adjustable parameters: the nature of the tilt-control material (through its symmetry, elastic constants, and oxygen rotation angles), and the relative thicknesses of the target and tilt-controlmaterials. As a result, a magnetic and electronic phase diagram can be obtained, normally only accessible by A-site element substitution, within the single SmNiO3 compound. With this unique approach, we successfully adjusted the metal-insulator transition (MIT) to room temperature to fulfill the desired conditions for optical switching applications.
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