Optimization of superconducting and mechanical properties of coated superconductor films

The aim of this study is to determine microstructure, superconducting and mechanical properties of YBa2Cu3O6.56 (YBCO) and YBCO thin films with Manganese (Mn) addition and BaMnO3 formation as a flux center. With this regard, YBCO superconducting films with/without Mn were spin-coated onto (001) SrTiO3 (STO) single-crystal substrates by metalorganic deposition using trifluoroacetate (TFA-MOD) technique.In order to determine solution characteristics which influence thin film structure; turbidity, pH values and rheological properties of the prepared solutions were measured by Turbidimeter, pH meter and Rheometer machines before drying and heating processes. In order to use suitable process regime, to define chemical structure and reaction type of intermediate temperature products, Differential Thermal Analysis-Thermograviometric (DTA-TG) and Fourier Transform Infrared (FT-IR) analysis were performed in the powder production using xerogels. Structural analysis of the produce films was performed through multipurpose X-ray Diffractometer (XRD). Surface morphologies of the films were investigated using Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM). Mechanical properties of thin films were determined as a function of Mn addition by CSM nanoindentation tester by calculating Young?s modulus and hardness due to load?unload sensing analysis. Elastic properties and limit (E and ? y) of film and substrate materials was designated by using finite element method (FEM) and nanohardness experiments. Failure properties of films ( ? f) will be obtained using a different algorithm with FEM.