Charge transfer, confinement, and ferromagnetism in LaMnO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>/LaNiO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>(001) superlattices

Lee, Alex Taekyung; Han, Myung Joon

doi:10.1103/physrevb.88.035126

Cited by 32 publications

(37 citation statements)

References 27 publications

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“…We note that EB is generally observed for ferromagnetic/antiferromagnetic or ferromagnetic/spin-glass interface. [67,68] This surprising result was attributed to the quantum confinement effect [69] and charge transfer between Ni and Mn [70] , which are more effective for (111) orientation compared with (001). Very recent XAS experiments confirmed the larger electron transfer across the interface for (111) heterostructures.…”

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confidence: 99%

Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states

et al. 2016

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Epitaxial heterostructures composed of complex oxides have fascinated researchers for over a decade as they offer multiple degrees of freedom to unveil emergent many-body phenomena often unattainable in bulk. Recently, apart from stabilizing such artificial structures along the conventional [001]-direction, tuning the growth direction along unconventional crystallographic axes has been highlighted as a promising route to realize novel quantum many-body phases. Here we illustrate this rapidly developing field of geometrical lattice engineering with the emphasis on a few prototypical examples of the recent experimental efforts to design complex oxide heterostructures along the (111) orientation for quantum phase discovery and potential applications.

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confidence: 99%

Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states

et al. 2016

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“…7 Lee and Han investigated the electronic structure and magnetic properties of LNO/ LMO SLs using the first-principles calculations in the framework of density functional theory. 9 They concluded that the magnetic moments at Ni sites are induced by charge transfer between Ni and Mn at the interface, with only minor differences for (111)-and (001)-oriented SLs. 9 In addition, it was found that the couplings between Ni-Ni and Mn-Mn atoms, in some cases, could introduce an antiferromagnetic phase in the SLs.…”

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“…9 In addition, it was found that the couplings between Ni-Ni and Mn-Mn atoms, in some cases, could introduce an antiferromagnetic phase in the SLs. 9 Based on these theoretical studies, the EB effect should be mostly independent of the crystallographic orientation of the LNO/LMO SLs and possibly exists in other kinds of artificial heterostructures with charge transferinduced magnetic moments.…”

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confidence: 99%

Charge transfer-induced magnetic exchange bias and electron localization in (111)- and (001)-oriented LaNiO3/LaMnO3 superlattices

Wei

Barzola‐Quiquia

Yang

et al. 2017

Applied Physics Letters

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High-quality lattice-matched LaNiO3/LaMnO3 superlattices with monolayer terrace structure have been grown on both (111)- and (001)-oriented SrTiO3 substrates by pulsed laser deposition. In contrast to the previously reported experiments, a magnetic exchange bias is observed that reproducibly occurs in both (111)- and (001)-oriented superlattices with the thin single layers of 5 and 7 unit cells, respectively. The exchange bias is theoretically explained by charge transfer-induced magnetic moments at Ni atoms. Furthermore, magnetization data at low temperature suggest two magnetic phases in the superlattices, with Néel temperature around 10 K. Electrical transport measurements reveal a metal-insulator transition with strong localization of electrons in the superlattices with the thin LaNiO3 layers of 4 unit cells, in which the electrical transport is dominated by two-dimensional variable range hopping.

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“…To incorporate the effect of electron correlations within the Ni d orbital, the so-called simplified version of rotationally invariant DFT+U as suggested by Dudarev et al 38 was used with the effective U eff ≡ U − J varying from 0 to 5 eV. In the previous literature, the relatively small value of U ∼3 eV has been taken as a reasonable value 30,39,40 for a nickelate superlattice although it can be regarded as too small. Since the value of U eff can be an important issue, we scanned the range of U eff and discuss its effect on the electronic and magnetic structure.…”

Section: Computation Detailsmentioning

confidence: 99%

Effect of charge doping on the electronic structure, orbital polarization, and structural distortion in nickelate superlattice

Kim

Han

2015

Phys. Rev. B

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Using first-principles density functional theory calculations, we investigated the effect of charge doping in a LaNiO3/SrTiO3 superlattice. The detailed analysis based on two different doping simulation methods clearly shows that the electronic and structural properties change in a systematic way, and that the orbital polarization (i.e. relative occupation of two Ni-eg orbitals) is reduced and the Ni to apical oxygen distance is enlarged as the number of doped electrons increases. Also, the rotation angles of the NiO6/TiO6 octahedra strongly and systematically depend on the doping. Our results not only suggest a possible way to control the orbital and structural properties by means of charge doping, but also provide useful information for understanding experiments under various doping situations such as oxygen vacancy.

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Charge transfer, confinement, and ferromagnetism in LaMnO3/LaNiO3(001) superlattices

Cited by 32 publications

References 27 publications

Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states

Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states

Charge transfer-induced magnetic exchange bias and electron localization in (111)- and (001)-oriented LaNiO3/LaMnO3 superlattices

Effect of charge doping on the electronic structure, orbital polarization, and structural distortion in nickelate superlattice

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