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Analysis of the Local Properties in GdBCO and YBCO Coated Conductors using Low-temperature Scanning Laser and Hall Probe Microscopy  

Park, S.K. (Department of Physics, Kyungpook National University)
Ri, H.C. (Department of Physics, Kyungpook National University)
Publication Information
Progress in Superconductivity / v.13, no.3, 2012 , pp. 169-177 More about this Journal
Abstract
Distribution of the local properties in GdBCO and YBCO coated conductors was investigated using Low-temperature Scanning Laser and Hall Probe Microscopy (LTSLHPM). We prepared GdBCO and YBCO coated conductors to study the spatial distribution of the current density in a single bridge. Inhomogeneity of the ${T_c}^{max}$ in the bridge was analyzed from experimental results of Scanning Laser Microscopy (SLM) near the superconducting transition. The local transport and screening current in the bridge were also investigated using Scanning Hall Probe Microscopy (SHPM). A series of line scans of SLM of the GdBCO and YBCO sample showed that lines with more inhomogeneous distributions of ${\delta}V$ had more inhomogeneous distributions of ${T_c}^{max}$. The defect of the superconducting layer of the GdBCO sample caused by damage to the substrate affected the current flow. And we could analyze the redistribution of the current density using SLM and SHPM.
Keywords
scanning laser microscopy; scanning Hall probe microscopy; GdBCO; YBCO; critical temperature; current density;
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