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Fabrication and characterization of doped-YBCO large grainsZhou, Yu Xiang 01 January 2001 (has links)
No description available.
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Investigation of a superheated superconducting colloidDa Silva, Angela Jane January 1988 (has links)
In recent years, there has been increasing interest in the idea of using a superheated superconducting colloid (SSC) as a detector for neutrinos and dark matter candidates. The primary objective of this work has been to investigate the basic properties of an SSC, consisting of 7 μm radius tin grains imbedded in epoxy, using a pumped ⁴He cryostat with a low vibrational noise RF-SQUID readout system. The superheating-supercooling hysteresis curves of the colloid have been measured in applied magnetic fields ranging from 3.1 x 10⁻⁴T to 1.4 x 10⁻²T. The superconducting to normal phase transition in individual grains inside the colloid has been observed and the measured signal size is in reasonable agreement with the calculated values. Finally, it was demonstrated that the colloid could withstand up to 20Mrad of [omitted]-radiation without incurring a significant change in its superconducting-normal phase transition.
A new type of sample, consisting of a planar array of 1 μm thick metal squares deposited on a mylar substrate, was developed. Both indium and tin were used as a. fabrication material. The characteristics of such samples were investigated, again using the pumped ⁴He cryostat. The full Meissner effect was only observed for applied magnetic fields less than 5 x 10⁻⁵T. For higher applied fields, the samples behaved like type-[omitted] superconductors in the mixed state regime, exhibiting flux penetration and trapping. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
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Nonlinear effects in the Josephson-vortex terahertz photonic crystalWall-Clarke, Alex D. January 2013 (has links)
Analysis has been made of the amplitudes of the second and third harmonics when pumping a discrete frequency to the Josephson-vortex photonic crystal within the THz range of the electromagnetic spectrum. The results of numerical simulations show that there are certain resonance frequencies for these harmonics where the amplitudes are strongly enhanced. The frequencies at which these resonances occur can be tuned by an applied magnetic field and tilting the material with respect to the incident radiation. For the second harmonic it has been possible to describe these resonances analytically with a resonance approximation which displays good agreement with numerical simulations at and near the resonances. A similar perturbative method has been used to simulate the nonlinear mixing of two discrete THz frequencies in the JV photonic crystal, producing resonances for harmonics at the sum and the difference of these two input frequencies. This method can allow a high degree of control over the harmonic frequencies produced.
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Theoretical study of inhomogeneous properties in unconventional superconductorsJiang, Lei, 蔣磊 January 2005 (has links)
published_or_final_version / abstract / Physics / Master / Master of Philosophy
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Magnetic properties of low-dimensional solidsObertelli, S. D. January 1988 (has links)
No description available.
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Critical current and Lorentz force effects in superconducting thin filmsKumar, Dinesh January 1994 (has links)
No description available.
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Low dimensional organic conductorsMarsden, Ian Richard January 1991 (has links)
No description available.
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68 |
Quasiparticle dynamics at the superfluid '3He A-B interfaceFullwood, Elliot J. January 1996 (has links)
No description available.
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69 |
The development of an YBaâ†2Cuâ†3Oâ†7â†-â†#delta# composite superconductorBoden, Keith McMurray January 1993 (has links)
No description available.
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70 |
A study of rigorous techniques in strongly correlated electron systemsExeter, Jason Wesley January 1995 (has links)
No description available.
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