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High Pressure Studies Of Superconductivity, Narelle Jayne Hillier
High Pressure Studies Of Superconductivity, Narelle Jayne Hillier
All Theses and Dissertations (ETDs)
Superconductivity has been studied extensively since it was first discovered over 100 years ago. High pressure studies, in particular, have been vital in furthering our understanding of the superconducting state. Pressure allows researchers to enhance the properties of existing superconductors, to find new superconductors, and to test the validity of theoretical models. This thesis presents a series of high pressure measurements performed in both He-gas and diamond anvil cell systems on various superconductors and on materials in which pressure-induced superconductivity has been predicted. Under pressure the alkali metals undergo a radical departure from the nearly-free electron model. In Li this …
Depairing Current Density In Cuprate Superconductors, Manlai Liang
Depairing Current Density In Cuprate Superconductors, Manlai Liang
Theses and Dissertations
We report a study of the depairing critical current density in the electron-doped infinite-layer Sr1-xLaxCuO2 and Nd2-xCexCuO4-\delta system. In this work, many new apparatuses were set up to measure the samples. Resistance-versus-temperature transition curves measured at high pulsed current densities show the classic proportionality between the transition-temperature shift and the two-thirds power of the applied current. The measurement provides an assessment of the superfluid density in the system, and a secondary route for obtaining the penetration depth purely through a transport measurements.