Large orbital polarization in nickelate-cuprate heterostructures by dimensional control of oxygen coordination
In: Nature Communications, Jg. 10 (2019), Heft 1, S. 1-7
Online
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Zugriff:
Artificial heterostructures composed of dissimilar transition metal oxides provide unprecedented opportunities to create remarkable physical phenomena. Here, we report a means to deliberately control the orbital polarization in LaNiO3 (LNO) through interfacing with SrCuO2 (SCO), which has an infinite-layer structure for CuO2. Dimensional control of SCO results in a planar-type (P–SCO) to chain-type (C–SCO) structure transition depending on the SCO thickness. This transition is exploited to induce either a NiO5 pyramidal or a NiO6 octahedral structure at the SCO/LNO interface. Consequently, a large change in the Ni d orbital occupation up to ~30% is achieved in P–SCO/LNO superlattices, whereas the Ni eg orbital splitting is negligible in C–SCO/LNO superlattices. The engineered oxygen coordination triggers a metal-to-insulator transition in SCO/LNO superlattices. Our results demonstrate that interfacial oxygen coordination engineering provides an effective means to manipulate the orbital configuration and associated physical properties, paving a pathway towards the advancement of oxide electronics.
In correlated materials, physical properties depend on orbital occupancy and polarization. Here, a way to control the oxygen coordination via dimensionality of superlattices is presented that results in the change of orbital occupancy by 30%, which is larger than what has been achieved by other methods.
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Large orbital polarization in nickelate-cuprate heterostructures by dimensional control of oxygen coordination
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Autor/in / Beteiligte Person: | Zou, Tao ; Ho Nyung Lee ; Desautels, Ryan D. ; Rastogi, Ankur ; Charlton, Timothy ; Liao, Zhaoliang ; Fitzsimmons, Michael R. ; Skoropata, Elizabeth ; Guo, Er-Jia ; T. Zac Ward ; Sohn, Changhee ; Freeland, John W. ; Gao, Xiang |
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Zeitschrift: | Nature Communications, Jg. 10 (2019), Heft 1, S. 1-7 |
Veröffentlichung: | Nature Portfolio, 2019 |
Medientyp: | unknown |
ISSN: | 2041-1723 (print) |
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