Characterization of Electron Pair Velocity in YBa 2 Cu 3 O 7 − δ Thin Films

The superconducting phase transition in YBa2Cu3O7−δ(YBCO) thin film samples doped with non-superconducting nanodot impurities of CeO2 are the focus of recent high-temperature superconductor studies. Non-superconducting holes of the superconducting lattice induce a bound-state of circulating paired electrons. This creates a magnetic flux vortex state. Examining the flow of freeelectrons shows that these quantized magnetic flux vortices arrange themselves in a self-assembled lattice. The nanodots serve to present structural properties to constrict the ”creep” of these flux vorticies under a field response in the form of a pinning-force enhancing the critical current density after phase transition. In this work, a model for characterizing the superconducting phase by the work done on electron pairs and chemical potential, following the well-known theories of Superconductivity (Bardeen-Cooper-Scheifer & Ginzburg-Landau), is formulated and tested. A solution to the expression for the magnetic flux, zero net force and pair velocity will generate a setting for the optimal deposition parameters of number density, growth geometry and mass density of these nanodot structures.