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Title: Manipulation of orbital occupancy by ferroelectric polarization in LaNiO{sub 3}/BaTiO{sub 3−δ} heterostructures

We investigate the control of orbital occupancy by ferroelectric polarization in LaNiO{sub 3}/BaTiO{sub 3−δ} heterostructures. It is achieved by the ferroelectric displacement of Ti ions polarized downward (upward) to form (break) Ni–O–Ti covalent bonding at the interface, accompanied by charge transfer between them and the modulation of the conductivity of ultrathin LaNiO{sub 3}. This electrically switchable and bi-direction control of orbital polarization in LaNiO{sub 3} is up to 25%, different from the manipulation by epitaxial strain or quantum confinement. Our finding opens a window for electrical control of orbital polarization at an oxide interface.
Authors:
; ; ; ; ; ;  [1]
  1. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22486007
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CONFINEMENT; CONTROL; COVALENCE; EPITAXY; FERROELECTRIC MATERIALS; INTERFACES; MODULATION; OXIDES; POLARIZATION; STRAINS; TITANATES; TITANIUM IONS