Dissertation/Thesis Abstract

Investigation of current percolation characteristics in yttrium barium copper oxide coated conductor samples
by You, Gukseon, M.S., California State University, Long Beach, 2009, 77; 1466322
Abstract (Summary)

We have investigated ion beam assisted deposited (IBAD) coated conductors by scanning laser microscopy (SLM) to map how current flows in transition and superconducting regions. Our goal was to investigate the grain size and the factors to influencing the current distribution. Our results indicate that the non-uniform current distribution was generated by the grain boundary network and macroscopic defects. We estimate the grain cluster size from SLM to be 40 μm to 160 μm. Below the critical temperature, we investigated the local critical current (Ic*), the temperature at which SLM has the maximum signal (Tc*), and the maximum SLM voltage (δV max) as well as their relationship. We find that the weakest superconducting area with lower Ic* has lower Tc* and higher δV max. We have also observed interesting dots on the sample that have definitely higher Tc*.

Indexing (document details)
Advisor: Kwon, Chuhee
Commitee:
School: California State University, Long Beach
School Location: United States -- California
Source: MAI 47/06M, Masters Abstracts International
Source Type: DISSERTATION
Subjects: Condensed matter physics
Keywords:
Publication Number: 1466322
ISBN: 9781109171945
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