Buried moiré supercells through 
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 nanolayer relaxation

Burian, Max; Pedrini, Bill; Hernández, Nazaret Ortiz; Ueda, Hirokazu; Vaz, C. A. F.; Caputo, Marco; Radović, M.; Staub, U.

doi:10.1103/physrevresearch.3.013225

Cited by 5 publications

(7 citation statements)

References 68 publications

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“…An appropriate description along both of these directions is, however, crucial to accurately determine the long-range strain field associated with the dislocation. The interfacial Moiré periodicity can be determined by X-ray diffraction experiments (see Figure a–c for a plane-view and line cuts through the reciprocal space volume) and best fits simulated diffraction patterns for a 106/107 type Moiré motif . This periodicity with a Moiré lattice constant of 40.8 nm also compensates for the 0.93% lattice mismatch between the STO film and the LSAT substrate.…”

Section: Methodsmentioning

confidence: 78%

“…1,3,8−12 Recently, a highly ordered Moirélattice has been identified at the interface between SrTiO 3 (STO) and (LaA-lO 3 ) 0.3 (Sr 2 TaAlO 6 ) 0.7 (LSAT) by high-resolution X-ray diffraction reciprocal space mapping. 13 A 30 nm thick film of STO was grown on LSAT (001) by pulsed laser deposition, followed by 12 h of annealing at 1200 °C and ambient pressure. STO (a STO = 3.905 Å) and LSAT (a LSAT = 3.869 Å) both have a cubic lattice with a small mismatch of 0.93%.…”

Section: Introductionmentioning

confidence: 99%

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Combined Theoretical and Experimental Study of the Moiré Dislocation Network at the SrTiO₃-(La,Sr)(Al,Ta)O₃ Interface

Ricca,

Skoropata,

Rossell

et al. 2023

ACS Appl. Mater. Interfaces

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Recently, a highly ordered Moirédislocation lattice was identified at the interface between a SrTiO 3 (STO) thin film and the (LaAlO 3 ) 0.3 (Sr 2 TaAlO 6 ) 0.7 (LSAT) substrate. A fundamental understanding of the local ionic and electronic structures around the dislocation cores is crucial to further engineer the properties of these complex multifunctional heterostructures. Here, we combine experimental characterization via analytical scanning transmission electron microscopy with results of molecular dynamics and density functional theory calculations to gain insights into the structure and defect chemistry of these dislocation arrays. Our results show that these dislocations lead to undercoordinated Ta/Al cations at the dislocation core, where oxygen vacancies can easily be formed, further facilitated by the presence of cation vacancies. The reduced Ti 3+ observed experimentally at the dislocations by electron energy-loss spectroscopy is a consequence of both the structure of the dislocation itself and of the electron doping due to oxygen vacancy formation. Finally, the experimentally observed Ti diffusion into the LSAT around the dislocation core occurs only together with cation vacancy formation in the LSAT or Ta diffusion into STO.

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Section: Methodsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Combined Theoretical and Experimental Study of the Moiré Dislocation Network at the SrTiO₃-(La,Sr)(Al,Ta)O₃ Interface

Ricca,

Skoropata,

Rossell

et al. 2023

ACS Appl. Mater. Interfaces

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“…This small magnitude of α indicates that visual observations of changes in colour and/or transmittance, that are often reported for long-lasting high-temperature processing of STO at reduced oxygen pressure or in the presence of hydrogen or nitrogen 9 – 16 , can be hardly caused by oxygen substitutions/vacancies. We stress that here we avoided such high-temperature processing, during which structural and/or compositional inhomogeneity, as well as networks of dislocations or other structural defects can easily form in STO 19 .…”

Section: Resultsmentioning

confidence: 99%

“…The location may have an influence on the electronic structure and properties of STO. Furthermore, high-temperature processing may generate structural defects, such as dislocations 19 , whose role may be essential.…”

Section: Introductionmentioning

confidence: 99%

The electronic properties of SrTiO3-δ with oxygen vacancies or substitutions

Rusevich

Tyunina

Kotomin

et al. 2021

Sci Rep

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The electronic properties, including bandgap and conductivity, are critical for nearly all applications of multifunctional perovskite oxide ferroelectrics. Here we analysed possibility to induce semiconductor behaviour in these materials, which are basically insulators, by replacement of several percent of oxygen atoms with nitrogen, hydrogen, or vacancies. We explored this approach for one of the best studied members of the large family of ABO3 perovskite ferroelectrics — strontium titanate (SrTiO3). The atomic and electronic structure of defects were theoretically investigated using the large-scale first-principles calculations for both bulk crystal and thin films. The results of calculations were experimentally verified by studies of the optical properties at photon energies from 25 meV to 8.8 eV for in-situ prepared thin films. It was demonstrated that substitutions and vacancies prefer locations at surfaces or phase boundaries over those inside crystallites. At the same time, local states in the bandgap can be produced by vacancies located both inside the crystals and at the surface, but by nitrogen substitution only inside crystals. Wide-bandgap insulator phases were evidenced for all defects. Compared to pure SrTiO3 films, bandgap widening due to defects was theoretically predicted and experimentally detected.

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“…Moiré engineering has been extremely fruitful in the field of van der Waals 2D materials where it allowed one to induce flat electron bands in 'magic' angle twisted bilayer graphene leading to superconductivity and correlated insulator states [11,12,261]. Moiré superstructures have been recently observed in epitaxially grown systems, created via combination of substrate miscut steps and twin domains in the film [262], or via structural relaxation of a film on a closely lattice-matched substrate [263]. However, the fabrication of heterostructures via transfer of TMO membranes will permit a wider range of lattice combinations and include rotations (figure 8(d)).…”

Section: Moiretronicsmentioning

confidence: 99%

Freestanding complex-oxide membranes

Pesquera

Fernández

Khestanova

et al. 2022

J. Phys.: Condens. Matter

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Complex oxides show a vast range of functional responses, unparalleled within the inorganic solids realm, making them promising materials for applications as varied as next-generation field-effect transistors, spintronics, electro-optic modulators, pyroelectric detectors, or oxygen reduction catalysts. Their stability in ambient conditions, chemical versatility, and large susceptibility to minute structural and electronic modifications make them ideal subjects of study to discover emergent phenomena and to generate novel functionalities for next-generation devices. Recent advances in the synthesis of single-crystal, freestanding complex oxide membranes provide an unprecedented opportunity to study these materials in a nearly-ideal system (e.g., free of mechanical/thermal interaction with substrates) as well as expanding the range of tools for tweaking their order parameters (i.e., (anti-)ferromagnetic, (anti-)ferroelectric, ferroelastic), and increasing the possibility of achieving novel heterointegration approaches (including interfacing dissimilar materials) by avoiding the chemical, structural, or thermal constraints in synthesis processes. Here, we review the recent developments in the fabrication and characterization of complex-oxide membranes and discuss their potential for unraveling novel physicochemical phenomena at the nanoscale and for futher exploiting their functionalities in technologically relevant devices.

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Buried moiré supercells through SrTiO3 nanolayer relaxation

Cited by 5 publications

References 68 publications

Combined Theoretical and Experimental Study of the Moiré Dislocation Network at the SrTiO₃-(La,Sr)(Al,Ta)O₃ Interface

Combined Theoretical and Experimental Study of the Moiré Dislocation Network at the SrTiO₃-(La,Sr)(Al,Ta)O₃ Interface

The electronic properties of SrTiO3-δ with oxygen vacancies or substitutions

Freestanding complex-oxide membranes

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Buried moiré supercells through SrTiO3 nanolayer relaxation

Cited by 5 publications

References 68 publications

Combined Theoretical and Experimental Study of the Moiré Dislocation Network at the SrTiO3-(La,Sr)(Al,Ta)O3 Interface

Combined Theoretical and Experimental Study of the Moiré Dislocation Network at the SrTiO3-(La,Sr)(Al,Ta)O3 Interface

The electronic properties of SrTiO3-δ with oxygen vacancies or substitutions

Freestanding complex-oxide membranes

Contact Info

Product

Resources

About

Combined Theoretical and Experimental Study of the Moiré Dislocation Network at the SrTiO₃-(La,Sr)(Al,Ta)O₃ Interface

Combined Theoretical and Experimental Study of the Moiré Dislocation Network at the SrTiO₃-(La,Sr)(Al,Ta)O₃ Interface