Multilayer Nb-Ti for Use as Model Superconducting Microstructures
Thin film deposition techniques provide opportunities to control the microstructure of two-phase alloy superconductors more completely than that possible by conventional metallurgical processing. We have fabricated thin film multilayer structures based on Nb-Ti alloy superconductors. The goal is to provide model microstructures that can be easily compared to flux-pinning theories of high-critical-current superconductivity. In this study, multilayer Nb/Ti materials have been annealed to provide samples with a variety of superconducting / normal interfaces, ranging from atomically sharp interfaces to heavily inter-diffused interfaces. Measurements of electrical and microstructural properties are described and compared with model predictions from proximity coupling theory and alloy diffusion.
KeywordsCritical Magnetic Field Residual Resistivity Ratio Bilayer Period Normal State Property Thin Film Deposition Technique
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