Comparison of Local Nonlinearity in Patterned Superconducting Chips Composed of YBCO and TBCCO Materials with Vertical and Slanted Edge Structures
Dr. Stephen Remillard, Hope College
Two of the most commonly used materials for high temperature superconducting devices are Tl2Ba2CaCu2O8 (TBCCO) and YBa2Cu3O7 (YBCO). Using a scanning electron microscope to look at manufactured superconducting chips composed of these materials, we are able to examine the edge structures of the patterned superconducting carriers and characterize them as either vertical walled (good manufacturing) or slanted walled (poor manufacturing). The superconducting materials exhibit nonlinear behavior at microwave frequencies as exhibited by second and third order intermodulation distortion (IMD). The IMD of YBCO and TBCCO samples with both slanted and bricked walls was compared along with the effects of hysteresis generated from an applied static magnetic field. At all temperatures the second order IMD in YBCO samples, in comparison to their TBCCO counterparts, display higher surface current densities at a constant drive current. The third order IMD of YBCO samples, on the other hand, are shown to be lower than those of TBCCO samples.
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