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Showing 1 to 18 of 18 for “"LaAlO3"”.
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Ultra-high Mobility 2DEG Heterostructure Fabricate by Oxide Molecular Beam Epitaxy for Device Application
LaAlO3/SrTiO3 heterostructures with two-dimensional electron gas (2DEG) interface have been reported with remarkable electron transport properties, which is the demand for application of wide bandgap semiconductor devices in modern power electronics industries. Both LaAlO3 and SrTiO3 are stable …
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Growth-induced non-stoichiometry in complex oxide systems
… deviations as large as 10% in SrTiO3, LaAlO3, and NdNiO3 systems. We demonstrate that such chemical deviations can lead to significant changes in the bulk thermal and dielectric properties of SrTiO3 and LaAlO3 films. We have also investigated the interface between SrTiO3 and LaAlO3, …
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Non-Silicon MOSFETs and Circuits with Atomic Layer Deposited Higher-k Dielectrics
… germanium. Ternary oxides, such as La2-xYxO3 and LaAlO3, have been considered as strong candidates due to their high dielectric constants and good thermal stability. Meanwhile, the unique abilities of delivering large area uniform thin film, excellent controlling of composition and thickness to an …
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Emerging phenomena in oxide heterostructures
… developed near the interface in SrTiO3/LaAlO3, EuO/LaAlO3, Fe/PbTiO3/Pt, Fe//BaTiO3/Pt and Cs/SrTiO3 heterostructures. We study the interplay between physical interactions, and quantify parameters that determine physical properties of hetetrostructures. These theoretical studies help …
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Perovskites as New Support Materials for the Iron Based Fischer-Tropsch Synthesis
… catalysts are developed by preparing a series of LaAlO3 perovskites with partial substitution of lanthanum with 10 atom-% potassium, and 0, 10, 20, 60, and 100 atom-% substitution of aluminum with manganese. The performance of iron supported on these materials is compared with the one on LaAlO3 …
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Defect-induced magnetism and transport phenomena in epitaxial oxides
… behind the two-dimensionally conductive LaAlO3/SrTiO3 interface. All experiments, from varying deposition temperature, to oxygen pressure, to laser fluence or to the insertion of (doped) perovskite layers, point towards a structurally governed conduction mechanism, although the exact …
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Atomic resolution studies of oxide superlattices and ultrathin films
… atomic scale EELS. The interfacial sharpness of LaAlO3 films grown on SrTiO3 was investigated by the STEM/EELS technique together with electron diffraction. This interface, when prepared under specific conditions, is conductive with high carrier mobility. Several suggestions for the conductive …
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Verification of d-wave pairing symmetry by microwave intermodulation distortion measurements in yttrium barium copper oxide
… (PLD) Yttrium Barium Copper Oxide (YBCO) on LaAlO3 substrate. A low-temperature (T < 30 K) increase in IMD is the observation of an upturn of the nonlinear coefficient of the quadratic field dependence of the penetration depth. This IMD upturn is limited by the nonlinear Meissner effect that …
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High-throughput synthesis of functional oxide films
… were secondly deposited on dense LaAlO3 ceramics prepared by spark plasma sintering. Piezoforce microscopy was used to confirm the local ferroelectric properties. Thirdly, we investigate the growth of of metastable monoclinic Dy2Ti2O7 epitaxial films on polycrystalline La2Ti2O7 …
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Spin-Orbit Coupling in SrTiO3/Si Thin Films at High Carrier Concentration
… intensely in the past decade. At the SrTiO3 /LaAlO3 interface, quantum confinement effects and a tunable SOI have been demonstrated. Our research group has recently demonstrated the co-existence of electron correlations and strong spin-orbit coupling on SrTiO3 films on Si(001). Our group has …
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Nanostruktūrizuotų manganitų sluoksnių, legiruotų kobaltu, auginimas ir tyrimas /
… ranging from 0 to 0.17. LSMCO films grown on LaAlO3 substrates were epitaxial, while nanostructured films formed on sapphire-R and Al2O3 substrates. Structural studies have revealed that epitaxial LSMCO films are characterized by tensile and compressive stresses depending on the cobalt …
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Some Aspects of the Crystal Chemistry of Perovskites under High Pressures
… to phase transition and elasticity of LaAlO3 perovskite. This second order transition is determined to occur at ~14 GPa by the pressure variation of the squared frequency of the soft R-point mode in the structure. Elastic moduli are inverted from the calculated stress-strain data by the …
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Pulsed laser deposition of superconducting Sr2RuO4 thin-films and the role of crystallographic defects
… of epitaxial SRO214 thin-films grown by PLD on (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT). Growth parameters including temperature, substrate and target composition have been varied to understand their influence on the microstructure and electrical properties of SRO214. We also investigated the presence of …
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Growth, Characterization and Measurement of Epitaxial Sr2RuO4 Thin Films
… optimization in films grown on lattice-matched (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 (LSAT) substrates. Film composition was found to be greatly influenced by changes in oxygen pressure, substrate temperature, target to substrate distance, and laser fluence. High oxygen pressure, low substrate …
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Novel empowered supports for iron-based Fischer-Tropsch in a power-to-liquids process
… Two lanthanum-based perovskites were examined: LaAlO3-δ and LaTiO3-δ. The LaAlO3-δ catalysts were modified by substituting potassium to the A site and substituting 20 atom-% manganese to the B site. A range of materials with varying amounts of potassium, La1- xKxAl0.8Mn0.2O3-δ, (x = 0, 2, 4, 6, …
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Structure-Property Relations on Strain-Mediated Multiferroic Heterostructures
… successfully fabricated on top of (001)-oriented LaAlO3 single crystal substrates. The surface morphology, crystal structure, magnetic properties, and ME effects were evaluated and compared with CFO/rhombohedral BFO nanocomposites. To enhance the performance of ME heterostructures with PMN-PT …
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Probing nano-scale atomic and electronic structures of iron-based superconductors
… layers grown by molecular beam epitaxy (MBE) on LaAlO3 become superconducting when exposed to oxygen after growth at elevated sample temperatures. The interfacial strain caused by lattice mismatch is not detected in the thin-film. Oxygen, occupying interstitial sites, is detected next to the Fe …
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Functional Oxides in Optical and Electronic Applications by Atmospheric Pressure Spatial Chemical Vapour Deposition
… deposition on single-crystal substrates (SrTiO3, LaAlO3, and YAlO3) with both tensile and compressive strain, enabling epitaxial growth. The deposition process, conducted at 350°C, challenges the traditional requirements of high-vacuum and high-temperature conditions for epitaxial oxide films. …