Mn Valency at La0.7Sr0.3MnO3/SrTiO3 (0 0 1) Thin Film Interfaces

Riedl, Thomas; Gemming, Thomas; Dörr, K.; Luysberg, M.; Wetzig, K.

doi:10.1017/s1431927609090229

Cited by 19 publications

(15 citation statements)

References 40 publications

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“…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 . Our study suggests that the reconstructed OOR at the interface is another nontrivial factor in determining the interfacial magnetic property.…”

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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“…In this context, the most studied oxide interface system is the LSMO/SrTiO 3 (STO) interface. [3][4][5][6][7][8][9][10] Interfaces with other oxides of interest, such as LaAlO 3 (LAO) or MgO, have been less investigated. [11][12][13] Several studies conducted to analyze the properties of ultrathin manganite films on top of various substrates indicate a severe degradation of the magnetotransport properties below a critical thickness.…”

Section: Introductionmentioning

confidence: 99%

Interfacial effects in manganite thin films with different capping layers of interest for spintronic applications

et al. 2011

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We report on the use of surface-sensitive techniques (x-ray absorption spectroscopy and x-ray magnetic circular dichroism) to investigate interfacial effects in sputtered manganite thin films, La 2/3 Ca 1/3 MnO 3 (LCMO) and La 2/3 Sr 1/3 MnO 3 (LSMO), with different capping layers [MgO, LaAlO 3 (LAO), SrTiO 3 (STO), NdGaO 3 (NGO), and Au]. To ensure surface sensitivity, data were acquired by using the total electron yield detection mode. It is found that LSMO and LCMO films exhibit similar behavior when capped with oxide layers but dissimilar effects when a metallic capping is used. Almost bulklike Mn valence at the interface was observed in the case of LAO capping. However, a notorious increase of the Mn oxidation state was detected for both MgO and NGO capping layers. In contrast, metallic Au and STO capping promotes a reduction of the Mn oxidation state. These results are correlated with the x-ray magnetic circular dichroism data, showing a concomitant decrease of the saturation magnetization at the interface in those cases where a modification of the Mn oxidation state is observed.

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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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Mn Valency at La_0.7Sr_0.3MnO₃/SrTiO₃ (0 0 1) Thin Film Interfaces

Cited by 19 publications

References 40 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

Interfacial effects in manganite thin films with different capping layers of interest for spintronic applications

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

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