Atomic‐Scale Control of Electronic Structure and Ferromagnetic Insulating State in Perovskite Oxide Superlattices by Long‐Range Tuning of BO6 Octahedra. (2nd August 2020)

• Record Type: Journal Article
• Authors: Li, Weiwei; Zhu, Bonan; Zhu, Ruixue; Wang, Qiang; Lu, Ping; Sun, Yuanwei; Cafolla, Clodomiro; Qi, Zhimin; Chen, Aiping; Gao, Peng; Wang, Haiyan; He, Qing; Zhang, Kelvin H. L.; MacManus‐Driscoll, Judith L.
• Is Part Of: Advanced functional materials. Volume 30:Number 40(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-02
• Subjects: ABO3 perovskite oxides -- BO6 octahedra -- ferromagnetic insulators -- interfaces -- manganite thin films; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202001984
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Control of BO6 octahedral rotations at the heterointerfaces of dissimilar ABO3 perovskites has emerged as a powerful route for engineering novel physical properties. However, its impact length scale is constrained at 2–6 unit cells close to the interface and the octahedral rotations relax quickly into bulk tilt angles away from interface. Here, a long‐range (up to 12 unit cells) suppression of MnO6 octahedral rotations in La0.9 Ba0.1 MnO3 through the formation of superlattices with SrTiO3 can be achieved. The suppressed MnO6 octahedral rotations strongly modify the magnetic and electronic properties of La0.9 Ba0.1 MnO3 and hence create a new ferromagnetic insulating state with enhanced Curie temperature of 235 K. The emergent properties in La0.9 Ba0.1 MnO3 arise from a preferential occupation of the out‐of‐plane Mn d 3 z 2 − r 2 orbital and a reduced Mn eg bandwidth, induced by the suppressed octahedral rotations. The realization of long‐range tuning of BO6 octahedra via superlattices can be applicable to other strongly correlated perovskites for exploring new emergent quantum phenomena. Abstract : Interfacial control of BO6 octahedral rotations in ABO3 perovskites modifies the interplay between spin, charge, and orbital and lattice degrees of freedom and thus leads to new 2D emergent phenomena. An emerging ferromagnetic insulating state with enhanced Curie temperature is achieved by a long‐range suppression of MnO6 octahedral rotations in La0.9 Ba0.1 MnO3 through the formation of superlattice with SrTiO3 .