Preventing the Reconstruction of the Polar Discontinuity at Oxide Heterointerfaces

Boschker, Hans; Verbeeck, Johan; Egoavil, Ricardo; Bals, Sara; Tendeloo, G. Van; Huijben, Mark; Houwman, Evert Pieter; Koster, Gertjan; Blank, Dave H.A.; Rijnders, Guus

doi:10.1002/adfm.201102763

Cited by 80 publications

(107 citation statements)

References 25 publications

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“…In our case, the increase of the out-of-plane Mn-O-Mn bond angle with decreasing N is apparent in ( The current finding may provide a new insight to the 'dead' layer issue that are commonly found at the interface between manganite oxides and many perovskite substrates 36 , and has attracted renewed interests. In recent studies, orbital ordering, 37 polar discontinuity 38,39 , magnetic coupling to the titanate layer, 40 stoichiometry 41,42 and so on, have all been evidenced to couple to the interface magnetic property of the manganite layer, while a unified scenario is still lacking. Some recent studies on La 0.67 Sr 0.33 MnO 3 /SrTiO 3 interfaces have merged on the finding of increased amount of Mn 3 þ near the interface [43][44][45] and 3z 2 À r 2 orbital ordering irrespective of the strained state 37,45,46 .…”

Section: Discussionmentioning

confidence: 99%

Correlating interfacial octahedral rotations with magnetism in (LaMnO3+δ)N/(SrTiO3)N superlattices

et al. 2014

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Lattice distortion due to oxygen octahedral rotations have a significant role in mediating the magnetism in oxides, and recently attracts a lot of interests in the study of complex oxides interface. However, the direct experimental evidence for the interrelation between octahedral rotation and magnetism at interface is scarce. Here we demonstrate that interfacial octahedral rotation are closely linked to the strongly modified ferromagnetism in (LaMnO 3 þ d ) N / (SrTiO 3 ) N superlattices. The maximized ferromagnetic moment in the N ¼ 6 superlattice is accompanied by a metastable structure (space group Imcm) featuring minimal octahedral rotations (a À a À c À , aB4.2°, gB0.5°). Quenched ferromagnetism for No4 superlattices is correlated to a substantially enhanced c axis octahedral rotation (a À a À c À , aB3.8°, gB8°f or N ¼ 2). Monte-Carlo simulation based on double-exchange model qualitatively reproduces the experimental observation, confirming the correlation between octahedral rotation and magnetism. Our study demonstrates that engineering superlattices with controllable interfacial structures can be a feasible new route in realizing functional magnetic materials.

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Section: Discussionmentioning

confidence: 99%

Correlating interfacial octahedral rotations with magnetism in (LaMnO3+δ)N/(SrTiO3)N superlattices

et al. 2014

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“…Observed interfacial dead layers have, however, limited the scaling of potential devices [12][13][14] . While explicit attempts 15,16 to offset the interface dipole 17,18 and to eliminate extrinsic defects 14 have reduced the observed dead layer thickness, direct mapping of these intrinsic electronic and magnetic reconstructions at the interface can be obscured by variations in growth techniques leading to competing defects.…”

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confidence: 99%

Visualizing the interfacial evolution from charge compensation to metallic screening across the manganite metal–insulator transition

et al. 2014

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Electronic changes at polar interfaces between transition metal oxides offer the tantalizing possibility to stabilize novel ground states yet can also cause unintended reconstructions in devices. The nature of these interfacial reconstructions should be qualitatively different for metallic and insulating films as the electrostatic boundary conditions and compensation mechanisms are distinct. Here we directly quantify with atomic-resolution the charge distribution for manganite-titanate interfaces traversing the metal-insulator transition. By measuring the concentration and valence of the cations, we find an intrinsic interfacial electronic reconstruction in the insulating films. The total charge observed for the insulating manganite films quantitatively agrees with that needed to cancel the polar catastrophe. As the manganite becomes metallic with increased hole doping, the total charge build-up and its spatial range drop substantially. Direct quantification of the intrinsic charge transfer and spatial width should lay the framework for devices harnessing these unique electronic phases.

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“…The SrO-terminated LSMO thin film was developed as a limiting case of LSMO(001) surface following a number of experimental and theoretical publications. [70][71][72] The LSMO (001) The binding energies of 2-ZGNR, 4-ZGNR, pentacene and 4-ZBNNR with LSMO(001) substrate were calculated using the equation…”

Section: Computational Methods and Modelsmentioning

confidence: 99%

Theoretical Investigation of the Interfaces and Mechanisms of Induced Spin Polarization of 1D Narrow Zigzag Graphene- and h-BN Nanoribbons on a SrO-Terminated LSMO(001) Surface

et al. 2017

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The structure of the interfaces and the mechanisms of induced spin polarization of 1D infinite and finite narrow graphene-and h-BN zigzag nanoribbons placed on SrO-terminated La 1-x Sr x MnO 3 (LSMO) (001) surface were studied using Density Functional (DFT) electronic structure calculations. It was found that the p-conjugated nanofragments are bounded with LSMO(001) surface by weak disperse interactions. The types of coordination of the fragments, the strength of bonding and the rate of spin polarization depend upon the nature of the fragments. Infinite and finite graphene narrow zigzag nanoribbons are characterized by the lift of the spin degeneracy and strong spin-polarization caused by interface-induced structural asymmetry and oxygen-mediated indirect exchange interactions with Mn ions of LSMO support. Spin polarization changes the semiconducting nature of infinite graphene nanoribbons to half-metallic state with visible spin-up density of states at the Fermi level. The h-BN nanoribbon binding energy is weaker than graphene nanoribbon ones with noticeably shorter interlayer distance. The asymmetry effect and indirect exchange interactions cause spin polarization of h-BN nanoribbon as well with formation of embedded states inside the band gap. The results show a possibility to use one-atom thick nanofragments to design LSMO-based heterostructures for spintronic nanodevices with h-BN as an inert spacer to develop different potential barriers.Keywords: LSMO thin film, pentacene, spin states, induced spin polarization, graphene and h-BN nanoribbons, heterostructures, DFT+U calculations.* Author to whom correspondence should be addressed.The progress in developing of graphene-based spintronic nanodevices is related with weak spin-orbital interactions of carbon atoms, which enable one to utilize extremely high mobility of electrons together with long spin transport length. [1][2][3] The effectiveness of spin injection in carbon nanostructures by ferromagnetic supports (e.g. Ni(111)) has already been discovered experimentally and interpreted theoretically. 4,5 In particular, high magnetoresistance has been detected in p-conjugated organic media on ferromagnetic supports. 6-10 Isolating h-BN fragments located between graphene and ferromagnetic metallic supports have been used for chemical passivation of the surfaces and creation of tunnel contacts to promote graphene spin injection. [11][12][13] It was demonstrated that in 2D nanoheterostructures the injection coherence length could achieve up to 350 µm 14,15 due to interface-related Buchkov-Rashba effect. 16,17,18 Bychkov-Rashba effect is caused by the lift of spin degeneracy due to structure inverse asymmetry (SIA) 18 in 2D electron gas (2DEG) at the interfaces. 2DEG is confined by the effective electric field oriented in [001] direction caused by SIA effect, which, in many cases, is much stronger than the bulk symmetrical features. 19 For nonmagnetic surfaces, the Rashba field lifts the spin degeneracy of the surface states, 19 whereas for magnetic ones, it le...

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Preventing the Reconstruction of the Polar Discontinuity at Oxide Heterointerfaces

Cited by 80 publications

References 25 publications

Correlating interfacial octahedral rotations with magnetism in (LaMnO3+δ)N/(SrTiO3)N superlattices

Correlating interfacial octahedral rotations with magnetism in (LaMnO3+δ)N/(SrTiO3)N superlattices

Visualizing the interfacial evolution from charge compensation to metallic screening across the manganite metal–insulator transition

Theoretical Investigation of the Interfaces and Mechanisms of Induced Spin Polarization of 1D Narrow Zigzag Graphene- and h-BN Nanoribbons on a SrO-Terminated LSMO(001) Surface

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