Report on the Wisconsin-Stanford-Kansas-Davis-Florida State MURI on Scientific Challenges of Coated Conductors
Final rept. 1 Jul 2005-30 Jun 2006
WISCONSIN UNIV-MADISON APPLIED SUPERCONDUCTIVITY CENTER
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Coordinated, multi-institutional research University of Wisconsin, Stanford University, the University of Kansas, the University of California-Davis, and Florida State University is addressing key underlying scientific and engineering issues of Generation II Coated Conductors, and is fabricating and acquiring through collaborations forefront CC samples, developing new tools for their understanding and characterizing them so as to resolve key performance issues. Areas of concentration include substrates, buffer layers, the superconducting overlayer, their complex interactions, and the underlying physical mechanisms that determine conductor performance. Our thrusts have covered study of grain boundaries, electromagnetic characterization, fabrication of model samples relevant to coated conductors, nanoscale characterization by scanning probe and scanning transmission electron microscopies, and the formulation of detailed models of how and why low angle grain boundaries and other macroscopic obstacles become barriers to current flow. We consider the way in which epitaxy develops through from an IBAD or deformation-textured substrate, the choice of oxide buffer layer and the influence of the buffer layer formation method. Strong interactions with leading companies, the DOE laboratories and AFRL and other universities are in place.
- Electricity and Magnetism