Effect of disorder on the vortex dynamics in superconducting Josephson junction arrays and clusters
Rao, Subashri Vijendran
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https://hdl.handle.net/2142/23193
Description
Title
Effect of disorder on the vortex dynamics in superconducting Josephson junction arrays and clusters
Author(s)
Rao, Subashri Vijendran
Issue Date
1994
Doctoral Committee Chair(s)
Van Harlingen, Dale J.
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
We have studied the effect of intrinsic disorder on the transport properties of large Josephson junction arrays and clusters. In large arrays, intrinsic random disorder results in the washing out of features in the magnetoresistance. It also gives rise to multiple onsets in the resistive transition as a function of temperature. Large arrays are difficult to model because of the large number of junctions involved, thus we have studied the effect of local (single junction) disorder in smaller arrays referred to as clusters. The transport measurements on clusters indicate that features due to disorder in the junction critical currents, dominate the properties. We have developed a simple model in real space to understand the static vortex configurations and the motion of the vortices.
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