Electrodynamics of Nearly Ferroelectric Superconductors in the local London and non-local Pippard limits
Item
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Title
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Electrodynamics of Nearly Ferroelectric Superconductors in the local London and non-local Pippard limits
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Identifier
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d_2009_2013:a5b0f1699e5b:11058
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identifier
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10951
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Creator
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Aparajita, Upali,
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Contributor
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Joseph L. Birman | Sultan Catto
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Date
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2010
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Language
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English
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Publisher
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City University of New York.
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Subject
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Condensed matter physics | Materials science
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Abstract
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In this work, electrodynamics of a Nearly Ferroelectric Superconducting (NFE-SC) material in local London limit and nonlocal Pippard limit is reported. NFE-SC materials exhibit superconductivity and are in a nearly-ferroelectric state. One example of such materials is n or p doped SrTiO3. The structure of a single vortex in an NFE-SC thin film is explored. Taking n - SrTiO3 as our sample of choice, the frequency dependent magnetic field and current within the sample are calculated. The expulsion of the vortex from the sample at resonances is observed. The interaction between two vortices due to the presence of high background dielectric is explored. The effect of finite thickness on the vortex structure is explored for an NFE-SC film. With increase in film thickness, the resonances become sharper and as a result the system undergoes oscillatory transition between ferroelectric, superconducting and Meissner-like states.;Nonlocal effects in the NFE-SC thin film are explored in the Pippard limit. Specular Reflection and Random scattering are studied. Analytical as well as numerical methods are used to investigate the nature of the material and solve for the current and magnetic field within the sample. The current is found to be non-zero within the sample. The material properties can be manipulated to enhance or expel the current from within the sample with the change in frequency. The material shows complex transitions between Type-I, Type-II superconducting as well as Dielectric states. Numerical codes developed for the solution of the integro-differential equations are given.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Physics
