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Showing 1 to 20 of 62 for “"SrTiO3"”.
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Quantum Critical Ferroelectricity and Emergent Phenomena in KTaO3 and SrTiO3
… explores the quantum phase diagrams of KTaO3 and SrTiO3, both quantum paraelectrics near to a ferroelectric quantum critical point, including study of material properties which may be influenced by proximity to a ferroelectric quantum phase transition. A quantum critical phase transition is one …
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Photoelectrochemical determination of the low temperature redox kinetics in SrTiO3
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1989.
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Spin-Orbit Coupling in SrTiO3/Si Thin Films at High Carrier Concentration
Oxide heterostructure based on SrTiO3 have been a discovery ground for emergent physical phenomena, most notably conductivity at the interfaces between insulators. The 2DEG systems at the interface between SrTiO3 and in δ-doped SrTiO3 have been investigated intensely in the past decade. At the …
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La0,7Sr0,3MnO3-Dünnschichten auf SrTiO3 (0 0 1)-Substrat: Struktur und Mn-Wertigkeit
… und Mn-Wertigkeit von La0,7Sr0,3MnO3 (LSMO)/SrTiO3 (STO)-Dünnschichten, die mit außeraxialer gepulster Laserdeposition auf STO(0 0 1)-Substrat abgeschieden wurden. Aufgrund der hohen Spinpolarisation der Ladungsträger und der hohen Curie-Temperatur von LSMO sowie der geringen …
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Structural and magnetotransport study of SrTiO3-δ/Si structures grown by molecular beam epitaxy
SrTiO3 (STO) films were grown on p-Si (001) substrates using molecular beam epitaxy (MBE). Oxygen vacancies were introduced by controlling the Oxygen Pressure (PO2) that varied from 10-8 to 10-7 torr during growth, resulting in SrTiO3-δ with δ ~ 0.02% for the lowest pressure. The single phase …
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Development of Strontium Titanate Based Nanomaterials for Resistive Switching Applications
… the insulator. Among a variety of metal oxides, SrTiO3 has attracted extensive attention owing to its superior physical and chemical properties. In this dissertation, novel SrTiO3 resistive switching devices through solution processed approaches have been developed and their electrical properties …
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Novel applications of the Josephson Effect: Ferroelectric Characterisation and Capacitively Shunted Grain Boundary Junctions
… YBa2Cu3O7-d junctions shunted with a YBa2Cu3O7-d/SrTiO3/Au multilayer external capacitor, to make a junction with a hysteretic current voltage characteristic operating at high temperatures. A hysteretic junction with a McCumber parameter of 1.01 at 72.3K, with a critical current of 451mA and a …
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Spin transport in few-layer graphene
… on substrates of NdGaO3 (001), NdGaO3 (100) and SrTiO3 (110) were studied. And the study found nucleation-propagation along the easy axes at room temperature and 150 K. For LSMO on NdGaO3 (001) at 150 K, there was strong pinning to domain propagation. For LSMO on NdGaO3 (100) or SrTiO3 (110), …
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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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Photon-assisted spectroscopy of electronic interface states in perovskite oxide heterostructures
… with the model perovskite strontium titanate (SrTiO3) as a substrate and three differently doped lanthanum manganite thin films (10-15 nm thickness) grown by pulsed laser deposition (PLD) on the SrTiO3 substrate(La0.7Sr0.3MnO3, La0.7Ca0.3MnO3, La0.7Ce0.3MnO3). The first part aims at the …
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BiMnO3 turinčių kietųjų tirpalų sintezė ir tyrimas /
… for preparation of (1-x)BaTiO3-xBiMnO3 and (1-x)SrTiO3-xBiMnO3 solid solutions. Cubic structure was observed for all samples. Increase in BiMnO3 amount did not cause any visible changes in perovskite structure. Maximal amount of BiMnO3 in (1-x)BaTiO3-xBiMnO3 solid solutions was 60 % and for …
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Electrical transport and superconductivity in doped quantum critical ferroelectrics
… The materials of interest are doped SrTiO3, located close to the quantum critical point at ambient pressure and doped ferroelectric BaTiO3, which may be tuned to its quantum phase transition with hydrostatic pressure. In the project of carrier-doped SrTiO3, we observed unconventional …
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Atomic resolution studies of oxide superlattices and ultrathin films
… at low temperature. In a short period LaMnO3-SrTiO3 superlattice for optical applications, we discovered a modified band structure in SrTiO3 ultrathin films relative to thick films and a SrTiO3 substrate, due to charge leakage from LaMnO3 in SrTiO3. This was measured by chemical shifts of the …
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Charakterisierung von funktionellen Metalloxidgrenzflächen mittels Röntgenmethoden und Elektronenmikroskopie
… (Metall = Al, Ti, Pt), die TiN|TiO2- und die Si|SrTiO3-Grenzfläche mittels röntgenographischer Methoden sowie der Transmissionselektronenmikroskopie hinsichtlich ihrer Defektchemie, kristallographischen Anpassung und thermischen Stabilität untersucht. Die lokale elektronische Analyse der …
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Positron Annihilation Lifetime Spectroscopy Methodology and Application to Perovskite Oxide Materials
… <br/><br/>In contrast to PbTiO3, donor doping of SrTiO3 normally results in electron charge compensation. Recently this has been very clearly demonstrated for La3+ doped SrTiO3 thin films grown by molecular beam epitaxy (MBE) which exhibit exceptional electron mobilities. A series of MBE films …
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Struktur und Magnetotransport laserdeponierter Lanthanmanganat Dünnschichtsysteme
… La0.7Ca0.3MnO3/NdGaO3(110) und La0.7Sr0.3MnO3/SrTiO3(100) und an heteroepitaktischen Multilagen (La0.7Sr0.3MnO3/SrTiO3)n/SrTiO3(100) wurden die strukturellen, magnetischen und elektrische Eigenschaften in Abhängigkeit von der Schichtdicke und der Einfluß der Grenzflächeneigenschaften …
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Non-Silicon MOSFETs and Circuits with Atomic Layer Deposited Higher-k Dielectrics
… the complex oxide channel material SrTiO3 is also explored. Well-behaved LaAlO3/SrTiO3 nMOSFETs with a conducting channel at insulating ALD amorphous LaAlO3 - insulating crystalline SrTiO3 interface are also demonstrated.</p>
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Emerging phenomena in oxide heterostructures
… properties 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 …
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Growth-induced non-stoichiometry in complex oxide systems
… stoichiometry 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 …
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