In situ investigation of conducting interface formation in LaAlO3/SrTiO3 heterostructure

Yoo, Hyang Keun; Moreschini, Luca; Bostwick, Aaron; Walter, Andrew L.; Noh, Tae Won; Rotenberg, Eli; Chang, Young Jun

doi:10.1016/j.cap.2021.04.027

Cited by 2 publications

(3 citation statements)

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“…SrTiO3 (STO) is one of the most popular substrate materials for transition metal oxide heterostructures [1][2][3][4][5][6][7][8][9] . This is not only due to the commercial supply of very high quality crystals, but also many interesting phenomena in STO based heterostructures [4][5][6][7][8][9][10] . For example, high-Tc superconductivity has recently been discovered in a monolayer FeSe film on electron doped STO substrate 4 .…”

Section: Introductionmentioning

confidence: 99%

“…For example, high-Tc superconductivity has recently been discovered in a monolayer FeSe film on electron doped STO substrate 4 . Two-dimensional conducting electrons are formed at the interface between two band insulators, LaAlO3 film and STO substrate 5,9 . These interesting phenomena are strongly dependent on the surface treatment method of the STO substrate 4,5 .…”

Section: Introductionmentioning

confidence: 99%

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Direct visualization and control of SrOx segregation on semiconducting Nb doped SrTiO3 (100) surface

Yoo

Schwarz

Ulstrup

et al. 2022

J. Korean Phys. Soc.

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We investigated howSrOx segregates on a Nb doped SrTiO3 (100) surface by in air annealing. Using atomic force and photoemission electron microscopes, we can directly visualize the morphology and the electronic phase changes with SrOx segregation. SrOx islands less than 2 𝜇m in size and 1-5 unit cells thick nucleate first and grow in a labyrinth domain pattern. After prolonged annealing, SrOx forms a ~10 nm thick film. We show that the domain pattern can be controlled by introducing a surface miscut angle of SrTiO3. Additionally, the segregated SrOx has a lower work function, compared to that of SrTiO3. These results suggest that the control and tunability of SrOx segregation is applicable to the design of a new functional electronic devices in the semiconducting SrTiO3 based heterostructure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct visualization and control of SrOx segregation on semiconducting Nb doped SrTiO3 (100) surface

Yoo

Schwarz

Ulstrup

et al. 2022

J. Korean Phys. Soc.

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“…On the basis on the evolution of the octahedra distortion, electronic properties and interfacial magnetism in the superlattices, we discuss how the structural change correlates with corresponding charge transfer and magnetism for various LaNiO 3 thicknesses. Our results have implications for interpretation of the experimentally observed 16 magnetism and metal-insulator transition in similar systems 37,38 .…”

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confidence: 52%

Atomic scale interfacial magnetism and origin of metal-insulator transition in (LaNiO$$_3$$)$$_n$$/(CaMnO$$_3$$)$$_m$$ superlattices: a first principles study

Jiwuer

Tolbatov

Cossu

et al. 2023

Sci Rep

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Interfacial magnetism and metal-insulator transition at LaNiO$$_3$$ 3 -based oxide interfaces have triggered intense research efforts, because of the possible implications in future heterostructure device design and engineering. Experimental observation lack in some points a support from an atomistic view. In an effort to fill such gap, we hereby investigate the structural, electronic, and magnetic properties of (LaNiO$$_3$$ 3 )$$_n$$ n /(CaMnO$$_3$$ 3 )$$_m$$ m superlattices with varying LaNiO$$_3$$ 3 thickness (n) using density functional theory including a Hubbard-type effective on-site Coulomb term. We successfully capture and explain the metal-insulator transition and interfacial magnetic properties, such as magnetic alignments and induced Ni magnetic moments which were recently observed experimentally in nickelate-based heterostructures. In the superlattices modeled in our study, an insulating state is found for n=1 and a metallic character for n=2, 4, with major contribution from Ni and Mn 3d states. The insulating character originates from the disorder effect induced by sudden environment change for the octahedra at the interface, and associated to localized electronic states; on the other hand, for larger n, less localized interfacial states and increased polarity of the LaNiO$$_3$$ 3 layers contribute to metallicity. We discuss how the interplay between double and super-exchange interaction via complex structural and charge redistributions results in interfacial magnetism. While (LaNiO$$_3$$ 3 )$$_n$$ n /(CaMnO$$_3$$ 3 )$$_m$$ m superlattices are chosen as prototype and for their experimental feasibility, our approach is generally applicable to understand the intricate roles of interfacial states and exchange mechanism between magnetic ions towards the overall response of a magnetic interface or superlattice.

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In situ investigation of conducting interface formation in LaAlO3/SrTiO3 heterostructure

Cited by 2 publications

References 44 publications

Direct visualization and control of SrOx segregation on semiconducting Nb doped SrTiO3 (100) surface

Direct visualization and control of SrOx segregation on semiconducting Nb doped SrTiO3 (100) surface

Atomic scale interfacial magnetism and origin of metal-insulator transition in (LaNiO$$_3$$)$$_n$$/(CaMnO$$_3$$)$$_m$$ superlattices: a first principles study

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