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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 112 for “"critical current"”.
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Critical current anisotropy in high temperature superconductors
… understanding of the factors controlling the current carrying capacity of these materials is a prerequisite to their successful technological development. The critical current density (Jc) in HTS is directly dependent on the structure and pinning of the Flux Line Lattice (FLL) in these …
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Critical current density in hot-pressed garnet Li7La3Zr2O12 solid state electrolytes
… are still dendrites penetrating under a small current density in Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub>. This thesis is aiming to find possible controlling factors of critical current density.</p>
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Low frequency critical current noise and two level system defects in Josephson junctions
The critical current in a Josephson junction is known to exhibit a 1/f low frequency noise. Implemented as a superconducting qubit, this low frequency noise can lead to decoherence. While the 1/f noise has been known to arise from an ensemble of two level systems connected to the tunnel barrier, …
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Increased critical current density in rapidly grown RE-based cuprate superconducting coated conductors
… stage, is also investigated. This method is currently used industrially by SuNAM Co. Ltd., a collaborator on this project. We show that it is possible to replicate the liquid-assisted process used at the factory via pulsed laser deposition in a vacuum chamber. We use these results to …
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Non-fluorine precursor solutions for high critical current density REBa₂Cu₃O₇₋x̳ films
… precursor solution for YBCO films with high critical current densities (Jc). An aqueous nitrate precursor solution system was selected from three possible precursor solution systems. It was further developed to produce YBCO films with Jc > 1 MA/cm2. Films up to ~800 nm thickness were made, …
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Critical Current Enhancement In Magnetic Spin-Transfer Nano-Devices Through Doping With The Rare Earth Terbium
… the microwave noise until a higher turn-on current is reached, without compromising the ability of the device to switch with reasonable power in times scales as short as 1 nsec, terbium-doped structures point the way forward for future designs. Finally, we make direct FMR measurements of the …
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Vortex distributions and dynamics in superconductors near surface steps and sample edges studied by scanning SQUID microscopy and critical current measurements
… through transport measurements. By measuring the critical current at which the superconductor first develops a finite voltage, we are able to probe the entry of vortices at the edge of a superconducting strip in a perpendicular magnetic field. Our results display many of the characteristics …
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Development of an experiment to study the effects of transverse stress on the critical current of a niobium-tin superconducting cable
… Experimental Reactor (ITER). ITER is a current driven plasma experiment that could set a milestone towards the demonstration of fusion as a source of energy in the future. Cable-in-Conduit is the typical geometry for the conductor employed in superconducting magnets for fusion …
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Annealing Cryogenically Irradiated High TemperatureSuperconductors with Current Pulses
… REBCO microstructure, decreasing the magnet’s critical current. This lowers the reactor’s achievable magnetic field–and therefore performance. The damage, however, is not necessarily permanent. By applying a short current pulse above the critical current of the coated conductor, resistive …
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Grain boundary networks in RABiTS based YBa2Cu3O7[-delta] coated conductors
… thesis deals with the transport properties and critical current limitations found in YBa2Cu3O7[-delta] coated conductors prepared by the "rolling assisted biaxially textured substrate" (RABiTS) approach. For this purpose a buffer layer system composed of CeO2 and yttria-stabilised …
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Superconducting order parameter domains in Sr2RuO4 probed by Josephson interferometry
… Sr2RuO4 and a conventional superconductor. Their critical current modulations in an applied magnetic field carry information about the phase of the order parameter of the ruthenate. In these junctions, we observe multiple phase interference in a single tunneling direction which indicates the …
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Superconducting Order Parameter Domains in Strontium Ruthenate Probed by Josephson Interferometry
… Sr2RuO4 and a conventional superconductor. Their critical current modulations in an applied magnetic field carry information about the phase of the order parameter of the ruthenate. In these junctions, we observe multiple phase interference in a single tunneling direction which indicates the …
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YBa2Cu3O7-x thin films prepared by Chemical Solution Deposition
… of high Tc-superconductors require large critical currents and high-applied magnetic fields. Effective ways to increase the critical current density at high magnetic fields in YBCO are the introduction of nanoparticles and chemical substitution of yttrium by other rare earth elements. …
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Mechanisms of Metal Penetration in Solid Electrolytes
… electrolyte during electrodeposition, and at the critical current density these stresses drive brittle fracture within the bulk to create paths for metal advancement. This thesis demonstrates that metal penetration depends on two additional factors. The first is whether electric field focusing is …
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Josephson Interferometry Measurements in High-T(c) Grain Boundary Junctions
… temperature and magnetic field dependence of the critical current of 45° asymmetric grain boundary Josephson junctions are extremely sensitive to the onset of a complex order parameter. We have measured the critical current behavior of grain boundary junctions of YBCO and BSCCO as well as Ca, …
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Josephson Interferometry Measurements in High-Tc Grain Boundary Junctions
… temperature and magnetic field dependence of the critical current of 45° asymmetric grain boundary Josephson junctions are extremely sensitive to the onset of a complex order parameter. We have measured the critical current behavior of grain boundary junctions of YBCO and BSCCO as well as Ca, Co, …
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Electrical characterization of high temperature superconductors as a function of temperature
The critical currents of silver sheathed multifilamentary Bi 2Sr 2Ca2 Cu3010 (BSCCO- 2223/Ag) tapes at temperatures ranging from 77 K to 110 K were measured using a typical four-terminal technique for two different BSCCO-2223/Ag tapes manufactured by Vacuumschmelze (VAC). The critical currents for …
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Strombegrenzende Mechanismen YBa2Cu3O7-[delta]-Dünnschichten und -Quasimultilagen
… electrical transport properties and the maximum current carrying capability of YBa2Cu3O7-[delta] thin films and so called quasi-multilayers are investigated. These samples are prepared with pulsed laser deposition on single-crystalline substrates (SrTiO3) as well as on biaxially textured Ni …
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