Molecular Control Over the Interfacial Properties of High-T(c) Superconductors
CHICAGO STATE UNIV IL
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The surface coordination chemistry of the cuprate superconductor YBa2Cu3O sub 7 - gamma was extensively surveyed for the purpose of understanding the factors that govern the formation of robust, highly-ordered monolayers on these superconductor surfaces. Of the many functionalities investigated, long-chain primary amines formed the densest packed monolayer structure on both ceramic pellets and thin film substrates of YBa2Cu3O sub 7 - gamma Evidence for copper-amine interactions was obtained through SERS, and a computational model to accurately determine the local structure of the monolayer material was developed and implemented. Results of the computational study agree with experimentally determined properties of the materials. The computational studies also suggest that harmful water molecules are not able to penetrate the monolayer structure to damage the superconductor. This has been confirmed experimentally. Experimental evidence for two plausible mechanisms of monolayer formation was obtained in these studies. In addition, all surface modifications examined in this work did not damage the inherent superconducting properties of the bulk material.
- Physical Chemistry
- Electricity and Magnetism