Global ETD Search
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 331 for “"Superconductor"”.
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Josephson Currents In Two-Gap Superconductor-Insulator- Superconductor Junctions
… a way to investigate the transport property of superconductor-insulator-superconductor (SIS) junction with two-gap superconductors such as MgB2 and iron superconductors, we study the microscopic structure of the Josephson current in a tunnel junction with a very narrow quasi-classical barrier. …
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Towards the fabrication of suspended superconductor-graphene-superconductor Josephson junctions
Graphene, a newly discovered material. has been the subject of much experimental and theoretical study due to its unique electronic behavior. In this thesis, I present, my work with graduate student Joel Wang to design and fabricate Josephson junctions on high quality graphene samples. Using …
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Non-Sinusoidal Current -Phase Relations in Superconductor-Ferromagnet-Superconductor Josephson Junctions
… measured the current-phase relation (CPR) of a superconductor-ferromagnet-superconductor (SFS) Josephson junction, and determined that it contains a positive second-harmonic term proportional to sin(2&phis;). The second-harmonic term becomes dominant near Tpi, the temperature at which the …
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Proximity effects and vortex dynamics in mesoscopic superconductor-normal metal-superconductor arrays
… ranging from 2D semiconductors to disordered superconductors have in fact shown evidence of a ""forbidden"" zero-temperature metallic state. To reconcile these experimental results with Anderson localization, it has been proposed that these observations do not pertain to conventional metals, …
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Insulator -Superconductor Transitions in Two Dimensions
In the fifth part we analyze the behavior near the 2D IST in the presence of a perpendicular magnetic field. We show that with increasing field H, the QD and QC regimes, in which vortex degrees of freedom are suppressed, crossover to a new magnetically activated (MA) regime, where the correlation …
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Insulator-Superconductor Transitions in Two Dimensions
… charge transport properties near the insulator-superconductor transition (IST) points in two dimensions. The first part is devoted to the description of the relevant experiments that motivated our work. After introducing the techniques necessary to handle the description near the IST, we …
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Holographic superconductor with multiple competing condensates
… of superconductivity known as "Holographic Superconductors". In this thesis, we will be applying these same holographic principles to a strongly-interacting superconducting system in which multiple condensates compete. In the gravitational description, our system begins with two …
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Raman Scattering From the Superconductor Niobium-Diselenide
At 33 K 2H-NbSe(,2) distorts into an incommensurate charge density wave (CDW) state. The Raman spectrum shows amplitude modes of A and E symmetry near 40 cm('-1) induced by the CDW. At 7 K this material becomes superconducting, and at 2 K we observe additional Raman peaks near 20 cm('-1), one each …
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Raman scattering from the superconductor niobium diselenide
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-20T16:26:56Z No. of bitstreams: 1 1980_sooryakumar.pdf: 4894483 bytes, checksum: b83932506b44613e06df11d7e7ea27fd (MD5)
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Advanced Numerical Modelling of Bulk Superconductor Magnetisation
… volume, below a certain (critical) temperature. Superconductors can be subdivided into two classifications; type-I, or type-II, with the latter exhibiting a ‘mixed-state’ of superconductivity across their volume. Through appropriate magnetisation, magnetic flux may become ‘pinned’ within type-II …
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Modifying the Composition of a High Temperature Superconductor
… purpose of this research was to recreate a known superconductor, YBa<sub>2</sub>Cu<sub>3</sub>O<sub>x</sub>, and modify it in an attempt to raise its transition temperature. A superconductor is any material that excludes magnetic flux from its interior when at a temperature below its transition …
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Superconductor -Insulator Transition in Quasi-One-Dimensional Nanowires
… a molecular templating technique. A well-defined superconductor-insulator transition (SIT) is observed in homogeneous wires with lengths less than ∼200 nm. The total normal state resistance of the wire is found to be the control parameter for this transition with the critical point occurring near …
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Scanning Tunneling Microscopy of the Cuprate Superconductor BSCCO
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-25T19:16:41Z No. of bitstreams: 1 Misra_Shashank.pdf: 6764572 bytes, checksum: 29d6fbdaec0a747259a1662befe29a65 (MD5)
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Superconductor-insulator transition in quasi-one-dimensional nanowires
… a molecular templating technique. A well-defined superconductor-insulator transition (SIT) is observed in homogeneous wires with lengths less than ~200 nm. The total normal state resistance of the wire is found to be the control parameter for this transition with the critical point occurring near …
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Tailoring Superconductor and SOFC Structures for Power Applications
High temperature superconductors (HTS) and solid oxide fuel cells (SOFCs) both offer the possibility for dramatic improvements in efficiency in power applications such as generation, transmission and use of electrical energy. However, production costs and energy losses prohibit widespread adoption …
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Reduced Indium Tin Oxide as a Transparent Superconductor
… the optics and quasiparticle generation in the superconductor, decreasing the performance of both [1]. However, integration of optical and superconducting components will be crucial for the development of electro-optical transducers for quantum networking [2], scalable readout of single photon …
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Processing and characterization of ceramic superconductor/polymer composites
… decades. ! Some of the growth areas for bulk superconductors are applications that rely on the ability of the superconductor to exclude magnetic fields or shape electromagnetic waves, for example, levitated vehicles, motors, and magnetic shields. Additional research, development, and …
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Growth and characterisation of Niobium/Gadolinium superconductor-ferromagnet nanocomposites
… Apart from this so-called ferromagnetsuperconductors which both superconducting and ferromagnetism order parameters are present in a uniform material, hybrid systems [8] are made form materials with different or even mutually exclusive properties. Therefore the overall property can be …
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The superconductor/semiconductor interface of V₃Si and Si
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Majorana-based Topological Quantum Algorithms in Magnet-Superconductor Hybrid Structures
Majorana zero modes harbored by topological superconductors may be the key ingredient for the realization of fault-tolerant quantum computing and topologically protected quantum devices. Magnet-superconductor hybrid (MSH) systems have proven to be an experimentally versatile platform for quantum …
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