Hope College Physics Department
Research Experiences for Undergraduates
|Project Title:||Comparison of local nonlinearity in patterned superconducting chips composed of YBCO and TBCCO materials with vertical and slanted edge structures|
|Student Name:||Sean Cratty|
|Student's Home Institution:||Hope College|
|Research Advisor:||Dr. Stephen Remillard|
|Source of Support:||
This material is based upon work supported by the National Science Foundation under NSF-REU Grant No. PHY/DMR-1004811 as well as support from Mesaplexx Pty LTD.
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
___________________________________________________________________________________________________________________________________________________________ Publications and Presentations:
S.K. Remillard, and S.R. Cratty; "Probing the Physical Origin of Locally Generated Nonlinearity in Microwave Superconducting Resonator Devices," Applied Superconductivity Conference, Portland, OR, October 8-12, 2012.
"Probing the Locally Generated Even and Odd Order Nonlinearity in Y-Ba-Cu-O and Tl-Ba-Ca-Cu-O (2212) Microwave Resonators around TC," Brooke M. Jeries*, Sean R. Cratty*, and S.K. Remillard, IEEE Trans. on Applied Superconductivity, Published on-line, Dec. 2012. Published in print, Vol. 23, no. 3, 9000105, (2013).