Search

Abstract: The dependence of superconducting layer thickness on the critical current characteristics was investigated in the range of 0.5–1.5μm for YBCO-coated conductors made by the PLD process. Since the dimension of the pinning is considered to be three as indicated by the pinning correlation length, it is concluded that the observed thickness dependence of the critical current density at low fields come simply from a degradation in the superconducting layer structure with increasing thickness. The irreversibility field and the n-value increase with the thickness. These dependencies are well described by the theoretical model of the flux creep and flow. [Copyright &y& Elsevier]

Abstract: Flux pinning properties of PLD-processed YBCO coated conductors deposited on IBAD substrate are investigated. The thickness of YBCO layer is changed in the range of 0.27–1.0μm. The thickness dependence of critical current density, n-value and irreversibility field are measured in a wide range of magnetic field. The results are compared with the theoretical flux creep-flow model. It is found that these pinning properties are strongly influenced by the thickness as well as the pinning strength. Optimum condition for high field application of this superconductor is discussed. [Copyright &y& Elsevier]