Emerging magnetism and anomalous Hall effect in iridate–manganite heterostructures

Nichols, John; Gao, Xiang; Lee, Shinbuhm; Meyer, T.; Freeland, J. W.; Lauter, Valeria; Yi, Di; Liu, Jian; Haskel, D.; Petrie, Jonathan R.; Guo, Er‐Jia; Herklotz, Andreas; Lee, Dongkyu; Ward, Thomas Z.; Eres, Gyula; Fitzsimmons, M. R.; Lee, Ho Nyung

doi:10.1038/ncomms12721

Cited by 138 publications

(170 citation statements)

References 45 publications

(55 reference statements)

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“…Our DFT results show a reasonable agreement with the experimental report in Ref. [20]. We also construct a phenomenological model to understand the microscopic mechanism of the surprising charge transfer at SIO/SMO interfaces.…”

supporting

confidence: 88%

“…This indicates that the charge screening length in SIO is longer than 1 unit cell, while the precise determination remains dif- Our DFT calculations and the experimental measurement in Ref. [20] have shown rather unique results, especially strong electron transfer from SIO to SMO in spite of the nearly identical work function between the two materials. First, we considered the possibility of oxygen non-stoichiometry.…”

mentioning

confidence: 86%

“…Recently, superlattices of SrIrO 3 (SIO) and SrMnO 3 (SMO) were epitaxially grown and their transport and magnetic properties were reported [20]. Among a number of characteristics, one of the most striking results was a quite large charge transfer of ∼ 0.5 electrons per unit cell from SIO to SMO regions.…”

mentioning

confidence: 99%

“…The larger distortion arises from the mismatch (∼ 0.9 %) between SIO (a = 3.94Å [30][31][32]) and STO (a = 3.905Å), the substrate material used in Ref. [20].…”

mentioning

confidence: 99%

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Charge Transfer in Iridate-Manganite Superlattices

et al. 2017

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Charge transfer in superlattices consisting of SrIrO3 and SrMnO3 is investigated using density functional theory. Despite the nearly identical work function and non-polar interfaces between SrIrO3 and SrMnO3, rather large charge transfer was experimentally reported at the interface between them. Here, we report a microscopic model that captures the mechanism behind this phenomenon, providing a qualitative understanding of the experimental observation. This leads to unique strain dependence of such charge transfer in iridate-manganite superlattices. The predicted behavior is consistently verified by experiment with soft x-ray and optical spectroscopy. Our work thus demonstrates a new route to control electronic states in non-polar oxide heterostructures.Electron density is one of the most important parameters controlling electronic phases in strongly correlated electron systems. As a milestone in condensed matter physics, high critical temperature superconductivity was discovered in Cu-based oxides by doping carriers into Mott insulating states [1]. This triggered an improvement in crystal synthesis techniques, leading to the discovery of a number of novel spin, charge and orbital states in complex oxide materials [2]. Thin film growth techniques have also improved dramatically [3,4]. In Ref.[4], Ohtomo et al. demonstrated atomically sharp interfaces between two insulating titanates with a metallic behavior. Such metallic interfaces led to the concept of electronic reconstruction originally proposed for K-doped C 60 systems [5,6]. One of the important aspects of the electronic reconstruction is that the valence state of constituent ions in such heterostructures can significantly differ from the corresponding valence state in bulk systems as a result of the electron transfer within the heterostructures. Such electron transfer can be manipulated by the polar discontinuity [7] or by the difference in the work functions [8]. The polar discontinuity was previously discussed in the context of III-V semiconductor heterostructures [9]. In this case, the discontinuity often leads to the atomic reconstruction because it is significantly more challenging to change the valence state than for transition-metal elements.Thus, hetero-structuring is expected to become a fascinating route to explore novel electronic states in complex * Copyright notice: This manuscript has been authored by UTBattelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan) † okapon@ornl.gov systems ...

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supporting

confidence: 88%

mentioning

confidence: 86%

mentioning

confidence: 99%

“…The larger distortion arises from the mismatch (∼ 0.9 %) between SIO (a = 3.94Å [30][31][32]) and STO (a = 3.905Å), the substrate material used in Ref. [20].…”

mentioning

confidence: 99%

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Charge Transfer in Iridate-Manganite Superlattices

et al. 2017

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“…As a consequence, novel interfacial functionalities, which are absent in the constituent materials, were intensively studied [2,3]. Empowered by potential spintronic applications, interfacial magnetism is of particular interest [4], especially the ones made of ABO 3 perovskite transition-metal oxides (TMO) [5][6][7].…”

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confidence: 99%

Ferromagnetism and matrix-dependent charge transfer in strained LaMnO₃–LaCoO₃ superlattices

Chen

et al. 2018

Materials Research Letters

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Interfacial magnetism at transition-metal oxide interfaces is of tremendous interest. The emergence of ferromagnetism and a matrix-dependent charge transfer between Co and Mn ions in the interdiffusion region of compressively strained LaMnO 3 -LaCoO 3 superlattices (SLs) were studied. The SLs exhibit considerable ferromagnetism, which is negligible in both constituents. This is explained by the matrix-dependent charge transfer between Co and Mn ions. That is, the valence state of diffused Co ions into LaMnO 3 shifts from 3+ to 2+ by adopting one electron from Mn 3+ , inducing the same amount of Mn 4+ , while the Mn ions that diffuses into LaCoO 3 remains Mn 3+ . IMPACT STATEMENTMatrix-dependent charge transfer effect was induced by the interplay between intrinsic and extrinsic effect in transition-metal oxides superlattices, which could be used to site-selectively modulate the electronic and magnetic states. ARTICLE HISTORY

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Symmetry‐Mismatch‐Induced Ferromagnetism in the Interfacial Layers of CaRuO₃/SrTiO₃ Superlattices

Shi

Zhang

Chen

et al. 2023

Adv Funct Materials

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By modifying the entangled multi‐degrees of freedom of transition‐metal oxides, interlayer coupling usually produces interfacial phases with unusual functionalities. Herein, a symmetry‐mismatch‐driven interfacial phase transition from paramagnetic to ferromagnetic state is reported. By constructing superlattices using CaRuO3 and SrTiO3, two oxides with different oxygen octahedron networks, the tilting/rotation of oxygen octahedra near interface is tuned dramatically, causing an angle increase from ≈150° to ≈165° for the RuORu bond. This in turn drives the interfacial layer of CaRuO3, ≈3 unit cells in thickness, from paramagnetic into ferromagnetic state. The ferromagnetic order is robust, showing the highest Curie temperature of ≈120 K and the largest saturation magnetization of ≈0.7 µB per formula unit. Density functional theory calculations show that the reduced tilting/rotation of RuO6 octahedra favors an itinerant ferromagnetic ground state. This work demonstrates an effective phase tuning by coupled octahedral rotations, offering a new approach to explore emergent materials with desired functionalities.

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Emerging magnetism and anomalous Hall effect in iridate–manganite heterostructures

Cited by 138 publications

References 45 publications

Charge Transfer in Iridate-Manganite Superlattices

Charge Transfer in Iridate-Manganite Superlattices

Ferromagnetism and matrix-dependent charge transfer in strained LaMnO₃–LaCoO₃ superlattices

Symmetry‐Mismatch‐Induced Ferromagnetism in the Interfacial Layers of CaRuO₃/SrTiO₃ Superlattices

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Emerging magnetism and anomalous Hall effect in iridate–manganite heterostructures

Cited by 138 publications

References 45 publications

Charge Transfer in Iridate-Manganite Superlattices

Charge Transfer in Iridate-Manganite Superlattices

Ferromagnetism and matrix-dependent charge transfer in strained LaMnO3–LaCoO3 superlattices

Symmetry‐Mismatch‐Induced Ferromagnetism in the Interfacial Layers of CaRuO3/SrTiO3 Superlattices

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Product

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Ferromagnetism and matrix-dependent charge transfer in strained LaMnO₃–LaCoO₃ superlattices

Symmetry‐Mismatch‐Induced Ferromagnetism in the Interfacial Layers of CaRuO₃/SrTiO₃ Superlattices